The life of a born-again Christian who lapsed back into the world of reason sounds like the stuff that Fringe epics are made from. But after a solid beginning, Rigby’s Afterbirth dips badly, with not even the little baby Jesus capable of resurrecting the show. There’s one nice joke about religion and censorship but the hour could have done with giving us more about the context and the trajectory of his conversion(s), but is ultimately just a ragbag of facial gymnastics and titbits about ghosts, Noah and the Alpha Course.

Pleasance Courtyard, 556 6550, until 30 Aug, 7.15pm, £8.50–£9.50 (£7–£8).