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Raised in Adelaide, South Australia, Nicholas lives in Melbourne, Australia.
Nicholas played the character of Stingray Timmins on the Australian soap opera Neighbours. His final performance as 'Stingray' aired on 23 March 2007. Nicholas travelled from Australia to the UK to perform pantomimes over the Christmas period. In December 2006, he performed at the Marlowe Theatre, in Canterbury, Kent, as Jack in Jack and the Beanstalk. He performed in Cinderella in the Gordon Craig Theatre in Stevenage from 1 December 2007 until 27 January 2008. He appeared in Jack and the Beanstalk once more, playing the titular role of Jack, at the Gordon Craig Theatre in Stevenage from 29 November 2008 until 25 January 2009. He was also involved with The Rayz, a London-based band which toured during September–October 2007, playing over 40 dates.
Nicholas appeared in the stage version of the Disney film High School Musical in London, playing the part of Jack Scott. The shows ran from Saturday 28 June 2008 until Sunday 31 August 2008 in the Hammersmith Apollo London. After moving back to Australia, he played Pepper in the Australian Tour of Mamma Mia!
In 2015 Nicholas' new series Footballer Wants A Wife was funded by Screen Australia. He was the Creator/Writer and Executive Producer of the series and played one of the lead roles - Steven Papakonstantinou.
- 1999 Chuck Finn – Episode: "Chuck Who" as Sam
- 2004 Good Morning Australia as himself (9 February 2004)
- 2004–2007 Neighbours as Scott Stingray Timmins
- 2005 Scooter: Secret Agent – Episode: "Operation: Mask-In-A-Can" as Vern
- 2013 Cheerleader Diaries
- 2014 Neighbours VS Zombies
- 2015 Footballer Wants A Wife
- 2015 Waste of Time
- 1999 Les Misérables – Sam
- 2000 The Boy From Oz – Young Peter Allan
- 2001 The Sound of Music – Kurt von Trapp
- 2002 Singin' in the Rain – Young Cosmo & Don
- 2002 Oliver! – The Artful Dodger (Melbourne)
- 2004 Neighbours Rocky Horror Show, (Melbourne)
- 2005 A Bunch of Ratbags (Theatreworks, (Melbourne)
- 2005 9 to 5 (The Dragonfly Theatre & Cabaret Restaurant, Melbourne)
- 2006–2007 Jack and the Beanstalk as Jack Trott (Marlowe Theatre, Canterbury, England)
- 2007 Oliver! – The Artful Dodger (Central Theatre, Chatham, England)
- 2007–2008 Cinderella as 'Buttons' (Gordon Craig Theatre, Stevenage, England)
- 2008 High School Musical: Live on stage as Jack Scott
- 2008–2009 Jack and the Beanstalk as Jack Trott (Gordon Craig Theatre, Stevenage, England)
- 2010 Mamma Mia! as Pepper ((Australia))
- "Press Office - BBC Children in Need 2007: Children in Need highlights". BBC. 24 October 2007. Retrieved 3 March 2012.
- "MAMMA MIA! The Global Smash Hit - Latest News - AUSTRALIAN CAST GET READY TO REHEARSE". Mamma-mia.com. Archived from the original on 7 October 2009. Retrieved 29 August 2012.
- Ben Nicholas [@benji_nicholas] (28 March 2016). "Little of some cheeky horse riding in NZ with my fiancé @stlilj" (Tweet) – via Twitter.
- Ben Nicholas [@benji_nicholas] (31 May 2016). "Me and the fiancé @stlilj" (Tweet) – via Twitter.