[3] Whilst casting for the role of Frank, Whiting recommended acting school friend, Luke Patrick to play his triplet brother.

Due to the characters popularity and fan-demand, Patrick returned regularly in guest and recurring roles including for the end-of-season cliffhangers in 2019,[8] 2020,[9] and 2024.

[10] Desperate to have children but with no stable partner in her life, Shortland Street clinic's head of nursing Carrie Burton (Lisa Crittenden) accepted sperm donations from nurse Steve Mills (Andrew Binns), Guy Warner (Craig Parker), Dr. Hone Ropata (Temuera Morrison) and Dr. Chris Warner (Michael Galvin), refusing to disclose whose sperm she used.

Carrie gave birth to triplets during good friend Meredith Fleming's (Stephanie Wilkin) leaving party and named them Frank, Finbar, and Sarah.

Declan proved to be a useless father and ended up fleeing the country to escape criminal associates, leaving Steve to be a surrogate parent.

Several months later Steve was devastated to realise Chris had discovered he was the father and had been visiting Carrie and the triplets in Australia (Adelaide to be precise).

Upon Finn's return to Shortland Street in 2016, he noted to Chris that Frank had struggled with Carrie succumbing to cancer, had pursued a life of crime, and was serving time in prison for armed robbery.

Breaking into Chris' house during Christmas 2016, Frank quickly made his mark in Ferndale, purposefully sabotaging local bar 'The I.V.'

Having successfully manipulated his way into a barman role, Frank met and fell in love with nurse Kylie Brown (Kerry-Lee Dewing) and whilst away on a long weekend together, the two married.

Frank was shocked with the return of his manipulative wife Mindy (Catriona Toop) who he believed was dead, making his marriage to Kylie void.

Getting involved in a drug smuggling business, Frank eventually returned to the hospital but in his guilt, hired the security guard he had previously assaulted who was inept at the job due to the resulting brain injury.

Reunited with his younger brother Phoenix (Geordie Holibar), Frank helped him care for newborn daughter Amelie but was shocked to discover he was embezzling significant amounts from their father.

Working at the bar, he tried to overcome his sadness with a brief fling with Shereez Baker (Timmie Cameron) but found solace in helping a young man who stole his motorbike.

Throughout 2024 Frank communicated with Chris as he followed leads to find brother Harry (Xander Manktelow) in Asia following revelations he had murdered two people.

Frank ultimately returned at Christmas alongside Finn and uncle Guy (Craig Parker) having located Harry and brought him home.

The characters of Frank, Finn, and Sass were introduced in 1993 during a whodunit storyline, revolving around sperm donation to the head nurse, Carrie Burton.

[5] Patrick was uncertain on the audience reaction to the coupling, "I'm definitely prepared for fans to be stunned, especially with Frank being a new character coming into Shorty and Kylie's the it-girl of Shortland Street".

[14] The skinny dip scene was Patrick's first day filming and despite recalling it as "embarrassing", he believed it was an easy way to break barriers between himself and Dewing.

[3] Actor Michael Galvin (Dr. Chris Warner) named the triplet's returns in 2016 as his favourite storyline, noting the "fun" the co-stars have on set.