The character was introduced as an extension of already established McQueen family and quickly became a fan favourite for her cute, bubbly personality and dark storylines.

During her first five years on the show, Porter was featured in numerous high-profile storylines, including: underage sex; the murder of Calvin Valentine (Ricky Whittle); teenage pregnancy; being the target of serial killer Silas Blissett (Jeff Rawle); falling down a lift shaft; discovering her boyfriend, Ethan Scott (Craig Vye) was dating two other women and forming a friendship with the girls; finding her long-lost father; relationships with Dodger Savage (Danny Mac), Will Savage (James Atherton) and Joel Dexter (Andrew Still); and her arrest for Calvin's murder.

[1] Theresa's storylines since her return have included: a breakout from prison; giving birth to her second child, this time with Dodger and her subsequent on-off relationship with him; a feud with Sonny Valentine (Aaron Fontaine); being involved in a train crash which saw Calvin's wife and her cousin, Carmel (Gemma Merna) save Theresa and die; being kidnapped by Will; agreeing to donate a kidney to Nico Blake (Persephone Swales-Dawson); a relationship with Patrick Blake (Jeremy Sheffield) which saw her care for him as he suffered from motor neurone disease; and being targeted by Nico as she plotted to kill her for her other kidney.

She agreed to reprise the role in 2020 for the programme's 25th anniversary on a short-term basis, however it was later announced that the character would not depart at the end of year as originally planned and Porter would remain in the soap indefinitely.

If I was going to pick a killer for Calvin I don't think anyone had a strong enough motive apart from Mercedes (Jennifer Metcalfe), Malachy and Spencer.

Mercedes is a woman scorned, and I don't think Spencer understands consequences so he could probably act without realising that if he shot Calvin he would die and that would be forever.

"[11] On 13 October 2013, it was announced that Porter had chosen to leave her role as Theresa after five years and would be filming her final scenes in late 2013.

[12] It was revealed, two months later, that Porter would be leaving to compete in the final series of Dancing On Ice, having previously appeared in the show in 2012.

"[12] Entertainment website, Digital Spy reported that Porter was expected to return after a break, with the door left open.

[21] In July 2014, Kirkwood later promised that Theresa's return would "cause havoc" upon the McQueen family as well as revealing that Porter had begun filming with the soap.

Theresa finds an unlikely friendship in Anita Roy (Saira Choudhry) and auditions for the part of The Virgin Mary in a nativity play produced by older cousin Carmel Valentine (Gemma Merna) and Cindy Cunningham (Stephanie Waring).

Anita begins to feel she is ugly and becomes increasingly ashamed of her skin colour after racial abuse from Gaz Bennett (Joel Goonan).

Theresa follows her wish and becomes a model for a project by Zoe Carpenter (Zoë Lister), for "Buff TV" while Newt breaks up with her, not a fan of her future career.

However, when saying goodbye, Theresa finds her mother's purse which contains a credit card in the name of her dead cousin Tina and is horrified.

Mitzeee then reveals to Theresa, and everyone at the fashion show, that she was involved in an affair with Heidi's husband Carl Costello (Paul Opacic) before arriving in the Village.

When Theresa is home alone, she hears a knock on the door, she goes to answer it but there is no one there, she walks up to the bins and finds a black balloon with a picture of a fox on it, she goes back in the house and finds Warren, who accuses her of telling someone that he forced a weak man into the burning building after he escaped, revealing to the viewers that she knew the whole time that Warren wasn't dead.

Warren recaps on how he escaped the fire, forcing her for answers of who she told, he threatens to drop her off the village wall arch, this leads her to confess that she killed Calvin.

Police officer Ethan Scott (Craig Vye) arrives at the McQueens' home to question Carmel over Warren's fake death.

With the help of one of Liberty's brothers, Dodger (Danny Mac), they spy on Ethan, only to find out he is seeing Rae Wilson (Alice Barlow).

Will starts to attend university, where he befriends newcomers Ash Kane (Holly Weston) and Annalise Appleton (Tamaryn Payne), and begins to neglect Theresa, seemingly ashamed of her.

Theresa becomes attracted to Warren's son Joel Dexter (Andrew Still) and after going on several dates, the pair become a couple, making ex-boyfriend Will jealous.

Carmel is also arrested after the police accuse her of shoplifting a dollhouse, though in reality it was Theresa, leading to her feeling her chances of adopting a child were over.

In a bid to get revenge on Carmel for facilitating her break-up with Dodger, Theresa climbs into bed with a drunk Jim and claims they had sex, though Nana soon uncovers the truth.

On 25 August 2014, Theresa returns and seeks Mercedes' help with escaping from prison as she is pregnant with a second child and decides to flee to Alicante.

Theresa manages to get herself admitted to hospital, with Mercedes pretending to be a doctor, and they both handcuff the prison officer to the bed and escape.

Theresa returns to the village after evidence is found Sonny tricked Carmel into making a statement against her, she immediately goes into labour where she gives birth to Dodger's baby girl, naming her newborn Myra-Pocahontas Regina Madonna Savage-McQueen.

At the reception, which takes place on a party train, Theresa discovers Kathleen-Angel's passport in Carmel's bag and is shocked.

As she heads to the hospital, Theresa offers to be a donor for Sienna and Dodger's daughter, Nico Blake (Persephone Swales-Dawson), who requires a kidney transplant, and learns she's a match.

Patrick initially rejects but then accepts the idea, eventually leading to them getting a grant to build a special needs unit at the school.

Theresa is devastated when she finds out that Patrick still loves Maxine so she throws her smoothie over him and demands half the scam money when its done.