His life is then taken in a wholly other direction when he investigates the disappearance of his best friend in series four's final episodes.

Cook is an outgoing, sexually promiscuous, and in many ways self-destructive young man, who appears to have come from a troubled family background.

Cook shows a great interest in the ladies, and all his partying can sometimes get out of hand, leading him into trouble.

Throughout the series, he is best friends with both Freddie and JJ, although at times, his sexual relationship with Effy Stonem drives a rift between them.

Despite his self-destructive lifestyle, Cook is sometimes caring and kind-hearted - as seen in his fondness for JJ, and his kindness to Naomi and Pandora when they are in tough times.

In "Everyone", Cook, Freddie and JJ meet Effy the morning before they start college, all instantly falling for her.

He ends up angering Johnny White, Kayleigh's father and a Bristol drug lord.

After an argument, Pandora defiantly tells Effy that Cook, due to his promiscuity and impulsive, carnal behaviour, belongs to no one.

Although Freddie reveals his true feelings for Effy in the episode, which she reciprocates, she goes back to Cook because she's afraid to love anyone.

Naomi later witnesses her teachers rigging the votes to prevent Cook from winning, and reveals this to the form after she is announced the winner of the elections.

They are almost arrested and, after running from the police, JJ pressures Cook into taking his prescription drugs, knowing they are designed both to make people relax and become more honest.

JJ and Cook arrive and Thomas Tomone (Merveille Lukeba) lets them into the club, announcing that Emily is already inside.

Cook, under the influence of JJ's drugs, is compelled to tell the truth and confesses that Effy loves Freddie.

In "Effy", Cook crashes the gang's camping trip, and in anger reveals many of the group's secrets, including the fact that he and Pandora are still sleeping together - which causes Thomas to break up with her.

They are found by JJ and Freddie, who try to bring them back, but soon realise that Cook is beginning to fall in love with Effy.

Neither Cook nor Freddie win, the winner in fact being JJ, resulting in the loss of the boat and Effy.

However, JJ chooses to pressure Effy to make a choice between the three boys; her gaze lingers on Freddie, causing Cook to leave in a fit of rage.

JJ and Effy arrive, followed by the townspeople hoping to claim Cook's dad's boat.

In "Thomas", The gang, excluding Effy, witness the suicide of a teenage girl, Sophia, after she had taken drugs.

Cook sees Effy and Freddie kissing at the party and takes his anger out on a fellow party-goer, severely beating him and ends up accidentally headbutting JJ also.

He is released from prison with an electronic tag and sent to live with his mother, Ruth, a famous artist.

At home, Cook bonds with his younger brother Paddy who adores him, but clashes with his vain and perpetually drunken mother.

Cook visits his mother's art exhibit and is shocked to learn that she had a brief sexual relationship with Freddie.

Cook argues with his mother, leaves the house with Paddy and steals Ruth's car, trashing it.

Later, Freddie tries to follow a freaked out Effy who ran away from him, but loses sight of her in the large crowd, however he runs into Cook and asks him for help.

Cook breaks into John's basement where he finds Freddie's blood stained clothes and shoes.

Cook gets up laughing, and admits he is a criminal and has no sense or impulse control, he then tells John that he knows he killed Freddie.

In "Rise", Cook has been on the run for three years, and is now working as a drug dealer in Manchester, having left his former life behind.

It was revealed in "Rise: Part 1" that Cook killed John Foster at the end of series 4 and has been on the run ever since.