Selina Cook (also Roberts) is a fictional character from the Australian Channel Seven soap opera Home and Away, played by Tempany Deckert. She debuted on-screen during the episode airing on 5 May 1994. Deckert was given the role of Selina after her third audition for the show. In 1996, Deckert fell ill and Louise Crawford played Selina in her absence. In 1997, Deckert decided to leave the serial, however briefly returned in 1998. Her return was filmed in Ironbridge, Shropshire, as part of the serial's first ever overseas location filming. Selina's last appearance to date was on 30 March 1998, where she agreed to marry Steven.

Selina was introduced to the show after she developed a crush on her teacher. Selina was portrayed as a tearaway, who had a reputation for being the "town tramp." She often went off the rails, due to arguments with her parents, but she was a good person deep inside. Inside Soap described her as a "tart with a heart who's simply misunderstood." Selina was also a tomboy who regularly dressed in tartan shirts and Doc Martens. Deckert revealed that Selina was supposed to be a clichéd bimbo, so she decided to introduce biker boots to the wardrobe department. Selina later decides to clean up her act and she begins dating Jack Wilson, who she believes is her soul mate. Selina has been central to many "bizarre" storylines such as having a miscarriage at school, being sexually harassed, stalked and entering a relationship with her school teacher Steven Matheson. The character has received mixed reviews from critics. Deckert earned a nomination for "Most Popular Actress" at the Logie Awards, for her portrayal of Selina.

Deckert auditioned for Home and Away three times in Melbourne. Following her third audition, she was asked to fly to Sydney for a screen test and was told she had the part of Selina. She was asked to return the following day to begin filming and Deckert had to leave her school in order to join the show. In 1996, Deckert fell ill and actress Louise Crawford played Selina during Deckert's temporary absence. In mid-1997, speculation grew around Deckert and whether she had quit the serial, though the Home and Away publicity department did not confirm nor deny her departure. However, Deckert did leave the serial in 1997. She made a brief return to filming in 1998.

Upon her arrival, Selina was described as being a tearaway with an attitude. Selina also had a reputation for being the "town tramp" and Deckert explained that while it was a pretty true description, it was not exactly Selina's fault. She said "She's a good person deep down even if she is a bit of a slut." Selina had lived in the Bay with her family all her life. She and her parents spent their time arguing rather than discussing their problems, which led to Selina going off the rails.

Deckert told Inside Soap that the reason for Selina's introduction was her crush on teacher Luke Cunningham (John Adam). Selina chases after Luke at the debutante ball, but Luke is not interested in her. Her attempts to seduce him, makes her a household name and reputation falls even further. Selina decides to clean up her act following the fiasco with Luke and she turns out to be a "tart with a heart who's simply misunderstood." Selina begins dating fellow wild child Jack Wilson (Daniel Amalm) and Deckert said that the relationship allowed her to portray Selina's softer side. Of this, she said "It comes as a big surprise to Selina when she realises that she really does like Jack. She's used to chasing anything in trousers! In fact, she finds herself falling in love, especially when she discovers Jack doesn't have any parents - she warms to him and sees him as a real soul mate." While interviewed by the Daily Mirror Deckert said "Selina has always been into boys, in fact, they're her only real interest."

Selina regularly dressed in leather jackets, tartan shirts and Doc Martens. Victoria Ross of Inside Soap opined that Selina had a "passion for dodgy fashion" and was not likely to blend into the background. Deckert said her character was not supposed to be a "real grunge chick" and explained that Selina was going to be a clichéd bimbo. The actress introduced the wardrobe department to biker boots and Selina became a real tomboy. Deckert told The Sun-Herald that some viewers were shocked at her real appearance as they thought Selina looked "like such a dog" in the show.

Selina develops a relationship with Curtis Reed (Shane Ammann). Ammann fell ill in real life so producers forced Deckert to have a blood test following kissing scenes. Although it turned out to be minor, changes to filming were made so their characters would not share many kissing scenes. In one storyline Selina discovers she is pregnant after a fling with Damian Roberts (Matt Doran). Deckert said it was a hard storyline and she was shocked because she had no idea what would happen to Selina. When producers informed her that Selina would miscarry, she was happy she would not have to act the birth scenes out. Selina miscarries in the school corridor and Deckert said it was a surprising element, but disliked having twenty extras watching her perform. Deckert later told a reporter from What's on TV that "she's always been a failure, but being a mum was something she was determined to do well."

Selina had a complicated relationship with her teacher Steven Matheson (Adam Willits). Their romance was rocky and it took many "twists" throughout its progression. Selina left Steven on their wedding day. Deckert said it was a typical soap wedding with plenty of mishaps along the way. A conclusion to their storyline and Deckert's final appearance to date, was filmed in Ironbridge, Shropshire. This was the first occasion the serial had filmed an episode overseas. The storyline saw Irene Roberts (Lynne McGranger) arrive to help Selina recover from malaria. She also reunited Selina with Steven, who arrived pledging his love for her.