Between 2001 and 2005, Thom acted in over thirty productions at the Bedlam Theatre in Edinburgh, where he met fellow performers David Reed and Humphrey Ker. In 2006 they formed The Penny Dreadfuls sketch group, who performed regularly on the Fringe and recorded the BBC Radio 7 series The Brothers Faversham, which was repeated on Radio 4, and the two Radio 4 afternoon plays Guy  and Revolution.

In 2011 he made his solo Edinburgh festival debut with the stand-up show Thom Tuck Goes Straight to DVD, which was nominated for best newcomer at the Edinburgh Comedy Awards.