Michael "Mike" Barnes is a fictional character from the long-running Channel 4 soap opera Hollyoaks, played by Tony Hirst. He first appeared in 2006. In 2010, soap opera magazine Inside Soap reported that the character would leave in late January with love interest Zoe Carpenter. This was later confirmed. The character briefly returned in August 2016 and the again in March and April 2017.
Mike arrives in Hollyoaks with daughters Sarah and Amy and wife Kathy. A loyal and devoted husband and father, Mike's relaxed and easygoing attitude to life leads to his being a constant irritant to his wife Kathy, and early storylines involving the couple see Mike trying to calm Kathy down when she throws tantrums at him. Mike is oblivious to the fact that Kathy has slept with Sarah's boyfriend Rhys Ashworth. When he finds this out on Kathy's 40th birthday, Mike loses his temper and throws Kathy out; however he eventually forgives her and takes her back, after the two decide to reconcile for the sake of their daughters. Mike and Kathy's marriage remains turbulent. Mike and Sarah help Amy as she gives birth to Leah Barnes. Kathy decides to raise the baby as her own and claims she is the mother. Mike becomes overprotective towards Amy during her relationship with Josh Ashworth. After reading her diary, Mike assumes that Amy is sleeping with Josh. He then makes her begin to take contraceptive pills. Amy tries to tell him that she is not sleeping with Josh.
Mike refuses to believe Amy and stops her seeing Josh. This conflict continues and comes to a head when Mike chases after Josh in a violent rage and ends up suffering a serious head injury when a terrified Josh defends himself by hitting him over the head with a brick in self-defence. After he returns from hospital, Mike reveals in a chilling tone to Josh that he remembers everything and continues to harass and intimidate Josh, saying he will press charges if he doesn't break up with Amy. However, he ends up dropping the charges after Suzanne Ashworth threatens to tell everyone that Amy is Leah's mother. However the truth over Leah's maternity is announced in a local tabloid thanks to Michaela McQueen.
Kathy becomes obsessed with Leah. Amy decides to be Leah's mother and raise her. Kathy kidnaps Leah, however is caught and is forced to stay with her mother in order to recover. Kathy then returns and Mike takes her back. Mike supports Sarah when she finds out her fiancé Craig Dean is having an affair with John Paul McQueen. Amy's ex-boyfriend Ste Hay returns. Amy begins a relationship with him and claims he is Leah's father. Mike has no other option but to let Ste move in. Amy, Ste and Leah then move out due to Mike's interference. After talking to them, Amy tells Mike to leave. Sarah befriends fellow student Zoë Carpenter and lets her move into the Barnes family home. Mike becomes a shoulder for her to cry on following her breakup with Darren Osborne. Kathy becomes extremely jealous of Mike and Zoë and accuses them of cheating, throwing Zoë's clothes over the street. Kathy then begins a vendetta against the Ashworth family. After Kathy is found out, it proves the final straw for Mike, who, unable to cope with Kathy's behaviour anymore, tells her to leave, which she does. Shortly after this, Mike files for a divorce. Mike and Zoë then share a kiss and sleep together. The pair then begin a secret relationship. Ste enters the Barnes household to borrow a heater and he catches, and films, Mike and Zoë sleeping together. Ste reveals Mike and Zoë's relationship at Leah's first birthday party by sending the clip of the pair to Amy and Sarah. Sarah is horrified and tells Mike to choose between her and Zoë, who he then chooses. Zoë finds out she might be pregnant and tells Mike, however she is not. Mike begins studying at Hollyoaks College, he then resumes his relationship with Zoë.
After Ste begins abusing pregnant Amy, she eventually seeks Mike's help, despite the two of them having fallen out over her relationship with Ste. Mike ignores her at the door, as he does not realise she is actually trying to escape Ste, and so she returns to the abusive relationship. When the abuse comes out, an enraged Mike goes straight round to Ste's flat and beats him up. Michaela McQueen develops feelings for Mike during he and Zoë's relationship. Michaela tries to kiss Mike and claims to love him. Mike turns Michaela down gently and tells her that she is beautiful and will make someone a great girlfriend one day. Zoe and Mike's relationship eventually ends after Zoe's drunken night of passion with his daughter Sarah is revealed. Initially not wanting anything to do with either of them, Mike seems to forgive his former girlfriend before his daughter, even going so far as to briefly seek to rekindle their relationship. However, he eventually welcomes his daughter back into his life and does not restart his relationship with Zoe. Mike feels uncomfortable when Sarah becomes involved in a relationship with Lydia Hart. Zoë steals a script belonging to Mike and uses it for her film project for college. The film is about Mike's decision whether to put a newborn Sarah up for adoption. Sarah feels she cannot forgive Mike after discovering this, however she eventually does. Mike goes to Zoë's lecturer Adrian and informs him of her deceit, she then fails her course.
Myra, Jacqui and Michaela temporarily move in to with Mike and Sarah after an infestation of rats in their house. Myra and Mike appear to become closer and she begins to have feelings for him. After Lucas's birth, Amy left to stay with her grandmother, leaving Ste to look after him. Abi and Daniel Raven befriend Ste but secretly plan to steal Lucas. Mike is suspicious over Abi and Daniel's interest. After finding Ste asleep while looking after Lucas, Mike takes him. Ste, Daniel and Abi approach Mike and confront him. Ste ends up taunting Mike about Kathy, Amy and Sarah. Angry, Mike punches Ste. The next day, Mike approaches Abi, who is looking after Lucas. Mike claims he deserves to look after Lucas, however Ste tells him he is seeing a solicitor to put an injunction against Mike.
In October 2009, Sarah dies after a parachute accident. Mike is informed by police and he collapses in grief. Mike and Zoe kiss and sleep together the next day however they both put it down to wanting some comfort. Zoe is questioned by the police as Lydia plants the knife used to sabotage the parachute under Zoe's bed, which leads to the police arresting her. Once he returns home, he informs Sarah's friend Hannah of her death. She collapses in grief. Archie Carpenter visits Mike and tries to tell him Zoe is innocent, however Mike does not listen and throws him out. Mike visits Zoe in prison, and he finally realises she did not kill Sarah. During her trial, Mike reads Sarah's diary and starts to believe Sarah killed herself. Zoe is found not guilty, and released. Zoe moves into the Barnes home, and befriends Lydia in order for her to confess. However, Mike and Amy catch Lydia and Zoe kissing and he throws her out. Lydia discovers Zoe's true intentions for being her friend and takes revenge. She leads her to Sarah's grave to kill her and herself. Mike, Charlotte Lau and Dave Colburn rush to the cemetery after finding a suicide note. Lydia stabs Zoe but is stopped from killing her by Charlotte and Dave as Mike holds Zoe. Mike apologises to Zoe in hospital, where she recovers, and he is angry at Charlotte for keeping Lydia's secret. Zoe decides to leave Hollyoaks to go travelling. She hints to Mike to come with her. However, he refuses, claiming he cannot leave Amy and his grandchildren. After a heart-to-heart with Amy, she convinces him to go. Mike, Zoe and Gilly Roach then leave.
In August 2016, Mike is seen visiting his daughter Amy and is furious when Amy and her fiancée Ryan Knight (Duncan James) decide to move to Hollyoaks village so that the children can be closer to Ste.
In March 2017, Mike returns for Amy's wedding and death.