As well as giving rise to The Goodies team, ISIRTA shows the roots of the Monty Python team very clearly, with Cleese, Chapman and Eric Idle all regular script contributors.
As with Round the Horne, the cast's adventures would sometimes be episodic with cliff-hanger endings each week as with "The Curse of the Flying Wombat" (3rd series), and "Professor Prune And The Electric Time Trousers" (7th series).