Gemma Johnson is a fictional character from the British soap operas Brookside and Hollyoaks, played by Tisha Merry. The character made her first appearance during the Brookside episode airing on 26 March 1990. Gemma was previously portrayed by Naomi Kamanga from 1990 until 1998 and Carla Jarrett from 1998 until 2000, in Brookside. Merry took over the role when the character was introduced into Hollyoaks in 2025. Gemma is initially characterised as a "naturally playful and inquisitive" child. She is introduced as the daughter of Mick Johnson (Louis Emerick) and Josie Johnson (Suzanne Packer) and is the sibling of Leo Johnson (Leeon Sawyer/Steven Cole). Packer left Brookside but Gemma and Leo remained in the series and Mick takes on the role of a single parent. One of Gemma's early stories featured her nearly drowning in a pond and writers made her centric to a missing child storyline. Producer Mal Young created a steroid addiction storyline for Mick and explored how it affects his children, as they become fearful of their usually kind father. Kamanga decided to leave in 1998, to focus on her studies and producers immediately recast the role to Jarrett. Writers then began to involve Gemma in more prominent teenage storylines. In 1999, they portrayed drug-related issues via Gemma. First she is deported from her holiday in Barbados after smoking cannabis. Then Gemma takes MDMA, collapses and is hospitalised. Packer reprised her role as Josie to facilitate Gemma's departure from Brookside in February 2000. She decides to move away with Josie and leaves Mick devastated.
Gemma was introduced into Hollyoaks in 2025 via a cross-over episode featuring Brookside and Hollyoaks characters. It formed part of Hollyoaks 30th anniversary. Merry's casting was announced via Lime Pictures, who kept the character's actual identity a secret until the episodes were broadcast. The Hollyoaks character, Donny Clark, was revealed to be Mick and he is reunited with Gemma. Merry also appeared as Gemma in Hollyoaks Later. The writers created a relationship for Gemma with gangster character Warren Fox (Jamie Lomas) and also affiliated her with another gangster character, Froggy Black (John Middleton). Merry described Gemma's revised characterisation as flirty, feisty and someone that people would not want to make an enemy of. Gemma's teenage antics garnered critique in television reviews and she was labelled a "wild child" and "wayward" character. An Inside Soap columnist assessed that Gemma had grown into a "sly" character.
Gemma is originally characterised as a "naturally playful and inquisitive" child. Writers also portrayed her as "a quiet, polite girl" during Kamanga's tenure in the role. Gemma is also shown to be a "happy" and "contented" child.Tibballs 1998, p.264. They created a good sibling relationship between Gemma and Leo, who behaves as a "loving brother" towards her.Tibballs 1998, p.265. Mick was portrayed as a father who "adored" his children.Tibballs 1994, p.24.
Her early storylines include nearly drowning in her garden pond. Gemma falls into the water and is saved by Geoff Rogers (Kevin Carson), who finds her lifeless, face down in the pond and manages to resuscitate her.Tibballs 1994, p.25. Writers also created a missing child plot featuring Gemma, in which she goes missing for days leaving Mick in fear, but she is later found safe. The storyline was broadcast in July 1991, when Gemma was aged five in the series. Mick and Josie's marriage ultimately fails again and she leaves to reconcile with Tony. This time she leaves Gemma and Leo in Mick's care.Hayward 1995, p.28. In another storyline, Josie's parents, Ben Christie (Jeff Diamond) and Rachel Christie (Angela Brinkworth) arrive and Gemma's uncle, Ellis Johnson (Francis Johnson) becomes suspicious of the Christie's motives for visiting. When Mick leaves Gemma and Leo alone with Ben and Rachel, they abscond with their grandchildren, taking them to live in Cardiff. Mick later travels to Wales to retrieve them and returns them home.Tibballs 1994, p.28.
In 1995, writers created an issue-led storyline for the Johnson family. Mick becomes addicted to taking steroids and they portrayed Gemma and Leo as being fearful of Mick during this storyline. Brookside producer, Mal Young wanted his show to explore a different type of drug addiction storyline to that they had previously played via Jimmy Corkhill (Dean Sullivan). He believed that Jimmy was the typical character to portray addiction whereas Mick, a protective father, was more impactful. He also wanted to portray the effects it has only the addict's family and how Mick copes as a single parent.Tibballs 1996, p.49. Mick's addiction causes him to take his moods out on Gemma and Leo. Young explained that "the fact is he's over protective towards Leo and Gemma. He tries to over compensate for his ex-wife Josie not being there. As a result, his expectations of them and indeed himself are far too high. But because he's basically a nice guy, to see him lash out at his kids has a bigger impact than if, say, Jimmy did. You don't expect it from Mick."
In December 1999, writers gave the character storylines involving drugs. The story begins when Gemma goes on holiday to Barbados with her friend Caroline. She later contacts Mick and reveals she has been deported from Barbados for smoking cannabis. During Brookside New Year's Eve episode, Gemma goes clubbing at The Millennium Club and takes MDMA. Gemma collapses as a result and is hospitalised.
In 2000, Packer reprised her role as Josie for a guest stint. A Brookside publicist told Wendy Granditer from Inside Soap that Josie's return would give viewers "a few surprises". When Josie returns she confronts Mick about Gemma's drug taking. Josie criticises Mick's parenting of their children and vows to take over. Writers played Gemma as "pleased" to have her mother around again but Leo is not. Mick becomes suspicious of Josie's motives for returning and takes her out for a meal to talk. Josie then attempts to seduce Mick despite her being remarried and Mick orders her to leave. Josie retaliates by vowing to fight for custody of their children. Gemma decides she wants to live with Josie and Mick is "devastated". Emerick told reporters from TV Choice that Mick feels "a bitterness" about Josie's return but "he knows living with her mum would be a big adventure for a 13-year-old." Emerick added that Leo is "really supportive" of Mick throughout the ordeal but "he's very hurt by Gemma's decision." In her final Brookside storyline, Gemma leaves to live with Josie and Jarrett made her final appearance during the episode broadcast on 23 February 2000.
Her next appearance occurred during the Hollyoaks and Brookside crossover episode and Gemma was confirmed to be the same character that had previously featured in Brookside. The scene also revealed that the Hollyoaks character Donny Clark (also played by Emerick) was actually Gemma's father, Mick Johnson. Writers featured Gemma prominently in the episode of Hollyoaks Later. Gemma is confirmed to be in a relationship with Warren. Gemma and Mick are taken hostage by Connor "Sully" Sullivan (Harry French) and Griff Farnedge (Nathan Hubble) and they demand a ransom from Warren. They also capture Dodger Savage (Danny Mac), with Griff beating and raping him. The episode concludes with Gemma's involvement in staging the situation in an attempt to rob Warren of his fortune. Writers added more surprises for its audience during Gemma's introductory weeks on the show. She was revealed to be working for the notorious gangster, Froggy Black (John Middleton). Mick explains to Gemma that he faked his own death because of the danger Froggy posed to his family. The episode also detailed that Gemma was seeking revenge against Mick. In another episode, Gemma is featured feeding information back to Froggy and Sully. Mick informs Gemma that Sully is a police officer and nearly confesses to murdering Griff. Gemma suspects that Mick knows more about Griff's disappearance and informs Froggy. She then telephones Griff but Warren has his phone and discovers that Gemma is involved in the scam.
An Inside Soap reporter revealed that Gemma would then try to befriend Mercedes after becoming jealous of her involvement with Warren. Writers played Gemma hatching a plan to ruin Mercedes life and snare Warren back. Merry told Louisa Riley from Inside Soap that Gemma "welcomes the challenge" to break-up Mercedes and Warren. Merry did not believe that Gemma felt threatened by Mercedes, despite her history with Warren because Gemma is that confident in herself. Merry added "if Gemma wants something, she'll get it. She's very headstrong and is a woman like we've never met before." Gemma then begins to manipulate Diane Hutchinson (Alex Fletcher) to help her scheme against Mercedes. Merry believed that despite Gemma liking Diane, she sees an opportunity and ends up "using her". She noted that Diane wants Mercedes gone because she had an affair with her husband, Tony Hutchinson (Nick Pickard). Merry believed that Gemma could be "dangerous" for Mercedes but she did not think Gemma is an evil character. Instead, she reasoned that Gemma is capable of "getting rid of someone in a way that's not too catastrophic". Merry revealed that writers planned to explore Gemma and Mick's relationship once again. She described plots that feature the duo discussing things and secrets being revealed. She concluded "there are some wonderful moments, father and daughter stuff. It's been really cool to play that out and explore their relationship."
In February 2000, Inside Soap published a feature profiling the "biggest brats" in soap operas and included Gemma. They assessed that Gemma was originally portrayed as "sweet, gentle and kind" but her stint at boarding school transformed her into a "pot-smoking, ecstasy-popping nightmare". They branded her "most malicious moment" as being her ruining her father's new year by taking drugs and threatening to leave if she has to return to comprehensive school. The reporter blamed Josie's absence as the root cause of Gemma's bad behaviour, noting she missed Gemma's formative years. Though they noted that "good dad" Mick's steroid addiction did not help Gemma's situation. They concluded it was a "fat chance" she would change her ways, noting "Gemma's plan of action seems to be to milk Mick's guilt - and wallet - for all she can get." A Hartlepool Mail critic chose the episode focused on the negative reaction from Gemma's school regarding her drug taking in their "pick of the day" feature. They added that despite being Brookside's "nicest bloke", Mick has "doesn't have much luck when it comes to his children." They concluded that Mick would soon forget Gemma's "trials and tribulations" once Josie returned. Jim Shelley writing for The Guardian lambasted Gemma and Leo as Mick's "pig ignorant kids". He also criticised Mick's hypocritical reaction to Gemma's ecstasy storyline, noting he had previously been addicted to steroids.
In 2025, Digital Spy's Erin Zammitt was surprised by Gemma's introductory plots in Hollyoaks. She branded Gemma working for Froggy and Sully being revealed as his son as "game-changing secrets" which made an "unexpected cliffhanger". Similarly, she wrote that Warren discovering the truth about Gemma was a "game-changing Gemma twist" and "shock cliffhanger". By November 2025, an Inside Soap reporter decided that Gemma had become a "sly" character. For her portrayal of Gemma, Merry was nominated in the category of "Soaps - Best New Casting" at the 2025 Digital Spy Reader Awards. Laura-Jayne Tyler from Inside Soap chose Gemma as one of her four "Unsung Heroes" of British soap opera characters in 2025, calling Gemma a " Hollyoaks firecracker". The following month, Tyler's colleague, Chloe Timms, praised Gemma for "stitching up evil Sully", commenting, "what a character she's shaping up to be!"
Recast, drugs and departure
Introduction into Hollyoaks
Reception
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