Rock Bottom is the bumbling minion of The Professor and one of Felix the Cat's more recurring enemies, first appearing in the Felix the Cat cartoons of the 50s and 60s (as opposed to the earlier silent era films). He acts as The Professor's sidekick. With more brawn than brains, he takes everything. He helps the Professor to try to steal Felix the Cat's Magic Bag but ended up failing.
He is depicted as a bull-dog of some description and unlike The Professor is seldom very bright and often messing things up - Rock Bottom's goal in life is to capture Felix's bag of tricks so as to please The Professor but the two have never succeeded in winning against the cat, no matter the number of crazy plans they come up with.
Rock Bottom appeared in The Twisted Tales of Felix the Cat episode Attack of the Robot Rat in where he was renamed LeadFanny. Unlike Rock Bottom from the 50s/60s cartoons, LeadFanny is a stereotypically gay character whose voice is an imitation of Harvey Fierstein. He is also heavily implied to be The Professor's (renamed Mad Doctor) lover.
He is a villain in the 1992 NES game "Felix the Cat".