The series featured Geoffrey Bayldon as the title character, an eccentric, incompetent, dishevelled and smelly (but lovable) old 11th century wizard who accidentally travels through time to the year 1970 and befriends a young red-headed boy, nicknamed Carrot (Robin Davies), who spends most of the rest of the series attempting to hide Catweazle from his father and farmhand Sam. Meanwhile Catweazle searches for a way to return to his own time whilst hiding out in 'Castle Saburac', a disused water tower, with his 'Familiar', a toad called Touchwood.