Corrected entry: When Fry and Leela go into Robot Hell, Nibbler leads the way. But when Bender rescues them and they fly away with him and his angel wings, Nibbler is not there - They've forgotten him. However, sure enough, he's back next episode.
Steve Cowan
27th Oct 2003
Correction: Nibbler did not in fact fall down the chutes with Fry and Leela. Therefore, he probably just left the fairground on his own (don't forget, he is actually very intelligent).
Steve Cowan