Callum first appears where he starts Hollyoaks sixth form college, he is seen as quiet and weird. He later meets
Maddie Morrison (
Scarlett Bowman), and he partners up with her to work on a project. Maddie soon develops feelings for Callum and they show their affections for each other by insulting one another. During a night out Callum spots Maddie with
Joel Dexter (
Andrew Still) and is jealous, after Maddie has a row with Joel, Callum walked her home where they later kissed each other, but Maddie ignored him the next day. Maddie tells
Tilly Evans (
Lucy Dixon) and
George Smith (
Steven Roberts) about the night and they later attempt to set them up by locking them together in the stock room they begin talking to each other and become good friends. The next day, Callum and Maddie get into a taxi and skip college and go on a date to the park and go cloud watching, they get on well until Callum talks nasty about Maddie's friends Tilly and George. They have another argument, but later make up once they arrive back. Callum later decides to end his relationship with Maddie. Callum struggles to cope when his mother,
Martha (
Carli Norris) drinking causes her to behave erratically. He tells her that she has to stop drinking or she may lose her the support of her family. She carries on drinking and Callum decides to get drunk too. He smashes his living room up, pushes Ash over and is arrested. He blames Martha and she promises to stop drinking. He manages to convince Martha to seek help but she soon begins drinking again. Callum takes a dislike to Ash's new boyfriend
Ally Gorman (
Daniel O'Connor) and tries to find more information about him. He discovers that he had been in a relationship with numerous women under a different identity. When Callum sets Ally up so Ash knows the truth, Ally talks his way out of the predicament. Callum becomes reluctant to let Martha back into his life after they evicted her from her own home. He attends a support group for children of alcoholics and listens to Martha's story. When Maddie is killed in a mini bus crash, Callum attends her funeral and tells his mum he will lay some flowers down by her grave. A week later, Callum finds out about his sister,
Lacey's secret romance with Ally. This angers Callum making him hit Ally and get angry with Lacey. Following Ally's arrest for fraud, Callum and his sisters agree that their mum can come back and live with them. In March 2013, headmaster
Patrick Blake (
Jeremy Sheffield) assign new student
Robbie Roscoe (
Charlie Wernham) to Callum's guidance, but they both discover he is trouble. Callum, in need for money to pay their rent, agrees to rob Price Slice with Robbie and
Finn O'Connor (Keith Rice) but changes his mind. The robbery goes ahead but as Callum tries to stop it he is shot in the leg. In hospital he flatlines but is revived. Callum begins a relationship with
Holly Cunningham (
Wallis Day), to the anger of her mum -
Cindy and upset of
Jason Roscoe, Holly's friend. In October 2013, Callum goes with
Jade Hedy (Lucy Gape), Holly, Tilly and
Esther Bloom (
Jazmine Franks) to Jade's uncle's countryside house for Esther's 18th birthday. While there, Jade is shown to have a killer streak and later attempts to kill Esther. Callum tries saving her but Jade kills him when she stabs him in the back with a samaurai sword. Jade later accidentally stabs herself while in a fight with Esther and Tilly and dies. A few days later, Callum's sister Ash is killed in an explosion in Hollyoaks village. ==Reception==