After being released from juvenile detention early, Mason waits a couple of weeks before joining his family in Erinsborough. When he arrives, Mason reassures his mother that he has changed his ways, but tells his father that he will not forgive him for helping to send him to juvie. Mason's brother,
Bailey (Calen Mackenzie), admits that he found $10,000 from the robbery, which he was also involved in. When the brothers go to retrieve the money, hidden in a garden gnome, they find it has gone. Mason intervenes when he sees Ralphie Mahone threatening Chris Pappas and begins flirting with Kate Ramsay. He asks her out, but she turns him down due to his age.
Lucas Fitzgerald (
Scott Major) gives Mason a job at his garage, while Mason's grandfather, Lou, learns that he has been to juvie. Bailey suspects that Mason's accomplice, Robbo Slade, was behind a break in at their house and to prove him wrong, Mason contacts Robbo. He turns up in Erinsborough and asks for his share of the proceeds from the robbery. Mason soon learns that Robbo has been dating Amber and playing the family off against each other. Realising that he needs to get rid of Robbo quickly, Mason takes a waitering job at Lassiter's Hotel to earn more money. In order to square his debt with Robbo, Mason agrees to take part in a robbery at Lassiter's. However, on the day, extra security staff laid on for Sonya and Toadie's wedding prevent Mason and Robbo from carrying out the robbery. While Robbo is berating Mason, they are spotted by Sonya and Robbo leaves. Shortly after an explosion causes Sonya to hit her head and lose her memory. Bailey spots the missing gnome in
Sheila Canning's (
Colette Mann) garden and he and Mason try to get it back. They tell Sheila the money belongs to Lou and she gives it to him. When he learns where it came from, he donates it to charity. The truth about the Mount Isa robbery comes out and it brings Matt and Mason closer. Mason's ex-girlfriend, Rhiannon Bates, arrives in town and he uses her to get information about Robbo. Realising that Rhiannon's presence is stopping him from winning over Kate, Mason tells her that does not want to be with her. Kate's uncle, Paul Robinson, learns about Mason's criminal record and attempts to blackmail him into leaving her alone. However, Mason is honest with Kate and they start dating. Sonya regains her memory, leading Mason to be arrested and charged with armed robbery. Kate breaks up with him, but Mason gets her to change her mind. Paul disapproves of Mason dating Kate, but offers Mason his lawyer's services. Kate's ex-boyfriend, Mark Brennan, returns and Mason is jealous when she spends time with him. Mason finds out Mark has a girlfriend in Sydney and they fight. When Kate tells Mason that she chose him, he believe that he is second best and breaks up with her. Mason changes lawyers at the last minute and is given a three-year good behaviour bond. Mason briefly dates Imogen Willis, but she breaks up with him when she realises he still loves Kate. Mason asks Kate if they can get back together and she tells him that she had a one-night stand with Mark. Mason assures her that he can get past it and they reunite. Mason and Imogen become co-owners of a car and Mason gets a job as a concierge at Lassiter's. Robbo returns to Erinsborough and Mason tips off the police. After making bail, Robbo comes to see Mason and they fight. Mason supports Kate when she tells him that she is infertile, but he is disappointed when he learns her housemates knew first. Robbo blackmails Mason for $10,000, threatening to release footage of himself and Amber having sex onto the internet. After failing to raise enough money, Mason asks Paul for a loan, but Paul insists on handling things his way. Robbo steps up his threat, causing Mason to ask Chris,
Joshua Willis (Harley Bonner) and
Hudson Walsh (
Remy Hii) for help. Hudson gets the money and the others are giving it to Robbo, Mason breaks into Robbo's squat and takes his laptop. That same night, Robbo is involved in a hit-and-run and he later dies in hospital. Imogen tells Mason that Amber took their car and when he finds it, he realises that it may have been involved in Robbo's accident. Mason fixes the damage to the car and dumps it near the hospital. Mason is questioned by the police and later asks Kate to give him a false alibi. Mason and Paul confront
Marty Kranic (
Darius Perkins), believing he is responsible for Robbo's death. Marty denies being involved and threatens Paul. When Mason suggests to Kate that they try for a baby, she realises that they both want different things and breaks up with him. Mason figures out the password to Robbo's laptop and is relieved to find the footage of Amber was not uploaded to the internet. He also discovers that Lauren emailed Robbo on the night of the accident. Hudson later confesses to running Robbo down. Matt learns Mason went to Paul for help, rather than him, causing another rift between them. They eventually sort their issues out. Mason tries to win back Kate, but she turns him down. Mason and Imogen then grow closer when they bond over their various problems. Rhiannon returns, bringing her son,
Jackson (Finn Woodlock), with her. Mason makes it clear to Rhiannon that he is not ready for a relationship, so she suggests they keep things casual. Rhiannon begins working alongside Mason at Lassiter's Hotel and he becomes a father figure to Jackson. When Rhiannon makes plans for them to live together, Mason realises that he is not ready for that kind of commitment and breaks up with Rhiannon. Mason learns Kate and Kyle had a one-night stand, and that Kate lied about Mark. After confronting Kate, Mason realises that he is not hurt and is ready to move on. He then realises that he has feelings for Imogen and is jealous when she begins dating
Isaac Woods (Josh Burton). Mason tells Imogen that he has feelings for her and tries to appear more intelligent to impress her. When he sees Isaac sneaking into an unoccupied Number 24, Mason reports him to the police and Isaac is arrested. Mason accompanies Imogen, Josh and Amber on a camping trip. He and Imogen go abseiling and Josh decides to give it ago, after Mason taunts him. Josh falls and seriously injures his shoulder, ending his professional swimming career. His father,
Brad (
Kip Gamblin), blames Mason, but Imogen supports him and they begin dating in secret. When Brad sues Mason for damages, Mason enlists Mark's help to clear his name and they find a broken
carabiner at the site of the accident, which the hire company accept as theirs. Brad drops the case against Mason and Josh forgives him. Imogen breaks up with Mason on his birthday because she does not feel he is
the one. Mason informs his family that he is taking a job in Darwin as he needs a fresh start. Lauren is reluctant for Mason to leave, but after Lou convinces her to support Mason, she gives her blessing for him to go. Mason leaves for Darwin after bidding farewell to his family. ==Other appearances==