Carl Costello is a fictional character from the Channel 4 soap opera Hollyoaks, played by Paul Opacic. The character was introduced by executive producer Paul Marquess and he debuted on screen during the episode broadcast on 19 July 2010. Carl arrived in the village as the new owner of The Dog in the Pond and the father of established character Jem Costello (Helen Russell-Clark). Carl departed from Hollyoaks on 1 December 2011 with his son Jason Costello (Victoria Atkin). Opacic later reprised his role and returned to Hollyoaks on 26 September 2012 and left again on the 5 October 2012. Opacic reprised his role once more in January 2013, which coincided with the exit of Mitzeee Minniver (Rachel Shenton). He returned on 25 January 2013 and departed again on 15 February 2013. Opacic returned again for a guest appearance on 10 July 2018, which ended in his character being murdered by Breda McQueen (Moya Brady) on 11 July 2018.