[1] In 2011, McGahern starred in the independent feature film No Party for Billy Burns which was written and directed by Padraig Conaty.
In 2021, McGahern hosted the RTÉ comedy panel show Clear History alongside team captains, Joanne McNally and Colin Murphy.
Chris Tordoff, creator of Hardy Bucks, spotted McGahern during a stand-up performance one night in Dublin and offered him a cameo on his new show.
[20] In 2014, McGahern wrote and directed The Devil's Ceili with Philip Doherty, which went on to win two awards including best play at the All Ireland Drama Festival.
[4] McGahern has also had acting roles in many Irish comedy series including, Bridget & Eamon, The Doireann Project, Nowhere Fast and Finding Joy.
The Republic of Telly sketch "Felix Bollard: A Serious Man" lampooned anti-LGBT rights campaigners' activities during the run-up to the marriage equality referendum of 2015 in Ireland.