Mason Radcliffe, played by Luca Toolan, first appeared in September 2023. Toolan announced his casting on social media saying: "There's a new kid joining the cobbles – Mason Radcliffe. It's an honour to be a part of a show that I've grown up on that has some of the warmest and most talented people." He was introduced as part of a bullying story line and first appeared when he first targeted
Ruby Dobbs (Billie Naylor) before recruiting others to help him bully her more. For his role as Mason, Radcliffe was longlisted for "Best Villain" at the
2024 Inside Soap Awards. Mason catches the attentions of
Dylan Wilson (Liam McCheyne) and Ryan's adoptive cousin
Liam Connor (Charlie Wrenshall). Mason, Dylan and Liam witnessed
Tyrone Dobbs (
Alan Halsall) talking to a police officer about his car being stolen and used in a hit and run which injured
Eliza Woodrow. A shocked Mason fled and later told Dylan and Liam that he was the one who stole Tyrone's car and had caused the accident and tells them to give him an alibi. Amy Jones from OK! suggested the story line was impactual by saying: "Coronation Street star Luca Toolan certainly made an impact when he joined the ITV soap earlier this year as bad boy Mason Radcliffe. Recently we've watched Mason rule the cobbles as he continues to influence those around him by leading them astray, particularly when it comes to young Dylan Wilson (Liam McCheyne). Just last month, we saw Dylan, Mason and Liam Connor picking on Ruby Dobbs in the heartwrenching school bullying storyline." At Weatherfield High, Mason and his friends teased
Ryan Connor (
Ryan Prescott) over his scars (which he got after being involved in an acid attack) but backed away when Ryan shouted at them.
Daniel Osbourne (
Rob Mallard) intervenes and makes Mason and his friends leave. Mason later encouraged Dylan and Liam to smoke a disposable vape pen, which makes Dylan feel sick and Liam suffer a severe asthma attack. Mason runs off, leaving Dylan to call an ambulance. Mason and his friends later mocked
Amy Barlow (
Elle Mulvaney) and her fellow protesters placards. This resulted in Amy nearly hitting Mason with one of the placards before police intervened and sent Mason and his friends on their way. After learning that Dylan's father
Sean Tully (
Antony Cotton) had disposed of their remaining vapes, Mason demanded that Dylan give him his designer trainers, which Sean had got him, as compensation for the lose of the vapes. After Sean discovered that Dylan's trainers were missing, he planned to go to the school about it. This caused Dylan to inform Mason of Sean's intentions. Not wanting to get into trouble, Mason framed Liam by placing the trainers in his school locker. Later, Mason was confronted by Liam's stepfather
Gary Windass (
Mikey North), who guessed that Mason had framed Liam. Gary warned Mason to stay away from Liam or else he would see more of him and next time, he would not be so friendly. Mason later sent a threatening voicemail to Liam in retaliation. At school, Mason warned Liam not to tell on him again or else his mother
Maria Connor (
Samia Longchambon) would suffer. Mason and his friends later confronted Liam and threw rubbish on him and called him a rat. Dylan witnessed the event, but did not intervene out of fear of Mason. When Mason started filming Liam on his phone, the latter retaliated and knocked the phone out of Mason's hand. This resulted in Mason threatening Liam with a knife. Mason was later approached by local police officer
Craig Tinker (
Colson Smith) and another police officer, who searched Mason for the knife, but did not find it on him. It was later revealed that Mason had Dylan hide the knife. Mason believed that Liam was the one who reported him to the police and sent him a vile picture of a rat, unaware that it was in fact Liam's stepbrother
Jake Windass (Bobby Bradshaw) who had phoned the police. Mason and Dylan later bunked off school and stole a box of vapes from Simon Barlow and went to Dylan's home. Afterwards, Simon's father
Peter Barlow (
Chris Gascoyne) arrived outside the House to confront the pair over the theft and threatened to break down the door. Upon learning from Dylan that Peter killed
Stephen Reid (
Todd Boyce), Mason challenged Peter to run him and Dylan over with his car. Outraged, Peter kicked open the door, causing Mason to flee the house in fear whilst Peter restrained Dylan. Later, Dylan tells Mason that he had hidden the vapes and the knife in a bin, to which Mason tells him to sell the vapes at Prima Doner and that he will collect the money whilst Dylan can keep the knife. After Liam got Dylan into trouble at school by questioning him about selling vapes, which was overheard by their headteacher, Mason confronted Liam and opened his bag and threw the contents to the ground before throwing the bag on top of a van as a warning to Liam to not interfere with his business again. Mason also videoed Liam struggling to retrieve his bag, which Liam later saw footage of. In January 2024, Mason stole Liam's phone at school and made him to beg in front of other students order to have it back. After Liam does this, Mason changes his mind and refuses to return the phone. Mason later pinned Liam to a wall, but Liam manages to escape by setting off the school's fire alarm. Mason reports what Liam did to the school's deputy headmistress
Orla Crawshaw (
Carla Mendonça) and later contacts Jake on his PlayStation 4 and tells him to tell Liam that if he wants his phone back, he will have to meet him at school the following day. Liam tells Jake to ignore the message as he thinks that meeting with Mason would lead to a fight, but following a talk with Gary about how bullies only understand violence, Liam decides that he will stand up to Mason. The following day, Mason gives Liam back his phone but then goads him into fighting Dylan, who had referred to Liam as a loser. Mrs Crawshaw arrives and breaks up the fight. Mason claims that Liam attacked Dylan for no reason, to which Liam agrees, out of worry of what the outcome would be if he told the truth. This results in Liam getting suspended from school. When Liam returns to school, Mason destroys a puppet he brought into school whilst Dylan films the scene on his phone. Mason later learns from Dylan that Maria had seen abusive messages they had sent Liam online, resulting in them deleting the messages in order to avoid punishment. Mason and Dylan are later confronted by Maria, who was returning a laptop Liam borrowed from school. She tells them that Liam would be moving schools because of them. Dylan began to feel bad about his actions whilst Mason treated the situation like a joke. After Mrs Crawshaw learnt that Liam used the laptop to search about suicide, she tells Maria, Gary and Liam that she would put Mason and Dylan into isolation for their actions towards Liam. Mason and Dylan later had a confrontation with Gary in the local playground with Mason warning Gary that Liam needs to watch his back. This causes Gary to lash out at Mason and throw him to the ground. Sean witnesses this and intervenes by threatening to report Gary to the police. Mason later visits Dylan and learns that Sean is now aware that Liam is being bullied. Mason warns Dylan not to mention him to Mrs Crawshaw. Mason later came across a remorseful Dylan about knock on Liam to apologise for his behaviour. Dylan claims that he was pressured by Sean into going to Liam. Mason tells Dylan not to speak to Liam and has him leave with him. Mason later texts Dylan and tells him not to mention his name to Mrs Crawshaw. However, this results in Dylan getting suspended from school by Mrs Crawshaw after he blamed only himself for Liam getting bullied and would not say who was also involved. Mason later visits Roy's Rolls where Liam, Maria and Gary are. Mason tries to act friendly towards Liam, only for Maria to confront him and tell him to stay away from them. Gary then tells Mason to leave, which he does. Liam later witnesses Mason bullying another boy at school. When the police learn about Mason threatening Liam with the knife, they search both Mason and Dylan's homes, but the searches are unsuccessful as Dylan had hidden the knife in Tyrone's garden. Mason later tells Dylan to meet him at a precinct with the knife. Dylan goes to the precinct and waits for Mason, only to approached by Craig and other police officers, who find the knife in Dylan's possession and arrest him. This makes Dylan realise that Mason set him up. Dylan tells the police about Mason giving him the knife and decides to plead guilty after learning that the bullying nearly caused Liam commit suicide. Mason attempts to visit Dylan at his home, but is sent away by Sean and
Eileen Grimshaw (
Sue Cleaver). Mason later meets Dylan at Victoria Gardens and is pleased when Dylan speaks of his intentions to plead guilty for possession of the knife. Dylan then reveals that he had told the police about the hit and run Mason did, but Mason stated that the police had to prove he did it. Unbeknownst to the two, their conversion is overheard by Gary, who passes on the information to Sean and Eileen. Maria and Gary are later told by the police that Mason had been charged after his fingerprints were found on the knife and that he could face a custodial sentence if he is found guilty. In April 2024 on the lead up to his court hearing, Mason has a girl named Bella lure Dylan to him under the claim of wanting to make peace with him. Bella agrees and invites Dylan in meet her for ice cream at the precinct. However, Bella is horrified when Mason along with his friends, confronts Dylan and warns him to retract his statement and pull out of giving evidence at the hearing under the threat of Mason's two older brothers coming after Dylan. At Mason's hearing, both Liam and Dylan make statements. At first, Dylan, after being threatened earlier by one of Mason's friends, denies that Mason had the knife, but is later convinced to be truthful. Mason is declared guilty by the judge in part because of Mason's unwillingness to give a testimony in his defence, but also says that she would not have come to her decision without Liam and Dylan's statements, though the judge delayed his sentencing for a week until she could hear from his youth justice worker, but as this had been Mason's second knife crime offence, the judge warned him that as a matter of law, the only sentence available would be a sentence of imprisonment. A few months later, upon Mason's release, Stu finds him beaten with a bloody face in the park, and offers him food at Speed Daal after he reveals his brother was responsible for his attack. Once there, Mason is outed by the furious parents for his previous actions. Stu and Yasmeen hear him out but say he must leave, though Stu is conflicted. Stu later offers him a job at Speed Daal. Again, Dylan and Liam are worried and their parents demand that Yasmeen fires him, but she and Stu come to his defence. Sean Tully posts damning reviews about the restaurant hiring a criminal. Yasmeen speaks to Stu about what they have done, asking if it's worth it. Stu says that Mason deserves a chance. Mason apologised to Liam and Dylan. Later on he finds out that Dylan now carries a
zombie knife to protect himself. Mason encourages Dylan to throw away his knife by handing it in to the
amnesty bin at the local police station. Betsy Swain, who has been hanging around and flirty with Mason, later frames him for the theft of a purse when he rejects hanging out with her. Dylan [who has become friends with Betsy] finds out what she has done, and despite what Mason put him through, tries to convince her to tell the police the truth – as Mason has been sent back to prison [Juvie] as he was reported by Stu for theft – despite pleading he didn't do it, Stu did not believe him. Stu eventually realises Mason is telling the truth and apologises. He offers Mason his job back but Mason rejects it. He also rejects Stu's offer for a place to stay with him and Yasmeen. He does not divulge to Stu and Yasmeen where he is now staying. Stu later leaves for Germany. Stu and Yasmeen do not find out that Mason was the one that ran over Eliza in 2023, and the storyline of him doing so is dropped. Yasmeen is concerned for Mason’s welfare after Stu leaves for Germany. However, she does not wish to have Mason staying in her home as she feels unsafe as a single woman living alone when Mason has history with his criminal brothers. Mason starts sleeping rough because his brothers regularly beat him up when he stays at home. He later takes refuge in Sally and Tim Metcalfe's house after Tim catches him sneaking in to steal food. Tim allows Mason to sleep on the sofa during the day and confesses to Sally after she assumes they are being burgled when she notices spilled food. Sally asks Mason to leave as she doesn't feel safe with him in the house due to his history, but later allows Mason to stay over the Christmas holidays. In January 2025, Mason helps to find evidence against his brothers Matty and Logan, as DS Lisa Swain (Betsy's mum) thinks they were responsible for her late wife's death during a hit and run. He hands in a war helmet that he thinks may be evidence that puts his brothers at the scene of the crime. Matty and Logan are later released due to lack of evidence and come looking for Mason for grassing them up to the police. Mason meanwhile has accepted a job offer from Stu in Germany and is preparing to leave. He goes back to the flat he shared with Matty and Logan, assuming they are still in the police station, to retrieve some old photos. Dylan keeps a lookout for him to ensure Matty and Logan don't turn up. However, as Mason and Dylan turn the corner, they realise that Matty and Logan are waiting for him outside at the bottom of the stairs. Mason tries to run from his brothers, by jumping off a balcony. However, Matty and Logan catch up with him and push Dylan over. Matty and Logan scuffle with Mason in the alleyway before Logan stabs Mason in the chest. It's later revealed that the knife was Dylan's zombie knife, and he hadn't got rid of it after all; rather, he'd stored it in a vent in the flat he shares with his father, Sean Tully, and had brought it to protect himself in case Matty and Logan turned up while he was keeping a lookout for Mason. Matty and Logan had pushed Dylan over and Logan had grabbed the knife from him, before giving chase to Mason. Abi Webster finds Mason and tries to help stem the blood. Abi calls the ambulance and anxiously waits for it to arrive, along with
Gary Windass, who is also at the scene. While
Asha Alahan is on duty, she receives the call that a young boy is in critical condition at Weatherfield precinct. Asha and the other paramedics must first attend a hoax call (from
Joseph Brown) before the one about Mason, which means they lose valuable time in getting to him. The ambulance arrives at the precinct; in the back of it, Betsy holds Mason's hand as she and Abi do their best to reassure him that he's going to be okay. Mason is taken to hospital, but he goes into cardiac arrest shortly after arrival, and dies. Mason appears in February 2025 as a hallucination to Abi who was suffering a breakdown following the death of Mason; and the memories that stirred of the death of her own son, Seb. ==Ange Carlisle==