The Zarn creature (voiced by Marvin Miller) returns one last time.
Before this, The Zarn had appeared in two of the very best Land Of The Lost episodes: The Zarn and Gravity Storm.
But I am sorry to say that his last guest role in the series, Baby Sitter, only has the good moment or two with The Zarn creature. The episode is frankly rather dull...which may explain why The Zarn never returned to the series.
But the creature, despite being nothing more than a well voiced visual effect, still stands as one of the best sci-fi products of 1970s TV. Maybe The Zarn would have been at home in the first season of Buck Rogers In The 25th Century (1979)?