Mark Brennan (also referred to as just Brennan) is a fictional character from the Australian soap opera Neighbours, played by Scott McGregor. He made his first appearance during the episode broadcast on 30 August 2010. McGregor initially had a four-week guest contract, but this was increased to six months. Shortly after, it was announced that McGregor's contract had been extended again to twelve months and that he would become a regular cast member. McGregor departed the serial on 22 June 2011, after his contract was not renewed. He reprised his role for a brief return from 20 May 2013, before rejoining the regular cast on 5 February 2014. McGregor departed Neighbours for a second time on 15 October 2019, but returned for a guest stint as part of the show's 35th anniversary celebrations on