High Quality Content by WIKIPEDIA articles! Carl Costello is a fictional character from the British 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. Carl departed from Hollyoaks on 1 December 2011 with his son Jason. Opacic later reprised his role and returned to Hollyoaks on 26 September 2012 and left again on the 5 October 2012. Opacic will reprise his role once more in January 2013, which will coincide with the exit of Mitzeee (Rachel Shenton).