The episode "Timeslides" introduces us to Smeg and the Heads, the rock band fronted by Lister during his teenage years. In the show, "Smeg" is portrayed by Craig Charles's brother Emile, while the two "Heads" are played by members of which real-life extreme metal band? Their 2013 studio album "Surgical Steel" was their first since 1996's "Swansong".
Carcass