| Character Profile | List of appearances |
Seth Costello is a fictional character from British soap opera, Hollyoaks. He is the son of Heidi and Carl Costello, the twin brother of Jasmine, later known as Jason, and the younger brother of Riley Costello, the half-brother of Jem Costello, the uncle of Bobby Costello, and the grandson of psychopathic serial killer, Silas Blissett.
Seth's major plot points include struggling with body image and turning to steroids, discovering his father's affair with his brother's fiancée, and being emotionally blackmailed by Warren Fox. Seth returned in December 2020 after nearly nine years away as part of the blackmail storyline involving the McQueens where its revealed his working with his grandfather Silas Blissett and is currently in a relationship with Theresa McQueen.
Biography[]
2010: Arrival[]
Seth moves to Chester with his mother Heidi, father Carl, brother Riley and twin sister Jasmine after Carl purchases The Dog in the Pond public house. (More needs to be added).
2010: Attracted to Sasha, Killing Nathan, Relationship with Fern & Joining a Band[]
Seth becomes attracted to Sasha Valentine and Jasmine takes a photo of her on Seth's mobile phone. Sasha tells Heidi and as punishment Seth cleans The Loft nightclub. Seth and Riley go to a cage fighting event after being invited by half-sister Jem's ex-boyfriend Liam McAllister who plans to exact revenge on Carl for ending his football career. At the afterparty, Liam gets Seth drunk and attempts to drown him in the Jacuzzi.
Mitzeee discovers Seth and resuscitates him. Seth and Riley are kidnapped by Liam and his brother Nathan and Carl arrives to free them. Carl is then tied up and Seth and Riley fight in order to save him. Seth, Riley and Carl escape and are chased by Liam and Nathan. Nathan follows Riley and Carl onto a rooftop, where he prepares to break Riley's leg. Seth pushes Nathan, who falls to his death. Seth begins dating Fern (who tells him that Jasmine has gender identity disorder. He is unsupportive towards Jasmine and is bullied at school because of her decision to take the persona of Jason. Seth joins Lee Hunter's boy band Guy Candy.
2011: Steroid addiction, Finding out about Carl's affair with Mercedes and Warren's Blackmail[]
At Seth and Jason's joint birthday party, Seth gets kissed by Esther Bloom, Later that night, Gaz Bennett offers Seth dodgy steroids. Seth seems to be getting led down a dodgy path, as he buys more pills from Gaz. Jason overhears Seth buying dodgy pills from Gaz, but Seth seethes at his brother for trying to get involved. Later, Seth is working out when the strain becomes too much and he collapses. Seth is rushed to the hospital, while Jason tells Gaz to come clean about the steroids, but he warns he'll be straight back in prison for dealing if he tells the truth.
In 2011, Seth finds out that Carl is having an affair with Riley's fiancée, Mercedes McQueen. Carl tells Seth not to tell anyone he agrees not to but warns him if he catches them again he will.
In September 2011, he spots Carl and Mercedes hugging and gets the wrong idea they tell him it was just a hug but he doesn't believe them but doesn't tell anyone. He later has a go at Mercedes, unaware that Mitzeee is listening, who then becomes suspicious and informs boyfriend Warren Fox. Seth leaves to go on Riley's stag do with Warren and Doug Carter. While on the stag do, Warren gets Seth a prostitute, so he can lose his virginity, In an attempt to get close to Seth in the hope that he will hear what secret he knows about Mercedes. He takes a pill and while having sex with the prostitute he begins to hallucinate and thinks he is having sex with Mercedes. He screams at her to get off and then falls asleep. When he wakes up, he finds the bed linen covered in blood, and the body of the prostitute outside, and presumes he has killed her. Warren then appears and sees what he had done and helps him get rid of the body and clean up the mess. Seth then starts to feel guilty for the murder and begins to see the ghost of the prostitute. He panics in front of Doug and ends up revealing Carl and Mercedes' affair to him.
Seth considers suicide as the guilt becomes too much. Seth then tells Riley that he has killed the prostitute but Riley doesn't believe him, so he takes Riley to where the body is buried and he digs it up. However, when Riley unwraps the body, it is not the prostitute - but the body of a pig, It is revealed that Warren set Seth up and tricked him in to thinking he had killed the prostitute when on drugs, in an attempt to get close to Seth and discover what secret he knew. However, Warren ends up finding out the truth from Doug as he threatens to let Riley drown unless Doug reveals his secret.
2011: Heidi's Death & Departure[]
Heidi is killed by her father Silas Blissett, Seth's grandfather, by mistake and is later revealed he has killed many other women. Seth becomes aggressive within his grief and has more than one outburst however with the support of his family he receives the help he needs. Mercedes and Riley continue to fight over their son, Bobby. Seth tries to get them to reconcile, however this does not work. Riley soon gets a job offer in Leeds, however he says he's staying for Bobby. However, Mercedes says to Riley that he can have Bobby, but only if he leaves the town forever. Riley agrees. He soon rents the pub to Darren Osborne and on New Year's Eve, he and Seth leave the village.
2020: Cunning Return[]
Seth was revealed as the mysterious helper to Silas in blackmailing the McQueen. He was then seen talking to Theresa McQueen about how they would soon have all her family's money. Theresa told Seth she loved him and that she hoped her family would eventually understand and forgive her, whilst Seth hoped to flee the country with Theresa.
Kill Count[]
Murders/Manslaughters[]
- Nathan McAllister, 25th October 2010 - Pushed Nathan off scaffolding in defence of Riley Costello. Nathan managed to stop himself from falling, but lost grip and fell into an oil tank, in which he was impaled by a spike.
Attempted Murders[]
None
Background Information[]
- In December 2011, it was announced that Miles Higson had finished filming with Hollyoaks and that Seth's final scenes would air at the end of that year.
Quotes[]
| “ | Hello mum. | ” |
— First line, to Heidi Costello.
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