Professor Snuggles & Mrs. Wubsy Tubsy
Professor Snuggles & Mrs. Wubsy Tubsy are one-appearance only characters who appear only in Operation: P.L.A.N.E.T. They are a parody of the Planet of the Apes characters, Cornelius and Zira, apes who help the main human characters escape back to Earth, which the episode is a parody of Planet of the Apes itself. They are alive Rainbow Monkey animatronics (simply, robots).
Professor Snuggles and Mrs. Wubsy Tubsy find both boys and girls fascinating and cuddle-licious like all Rainbow Monkeys. They thought that boys are an endangered species, and General Hugs, the main antagonist of the episode, orders Numbuh 4 to be "hugged to death". The pair helped Numbuh 3 and Numbuh 4 try to get back to their own planet, but the rocket turns out to be nothing but an amusement-park attraction.
Soon, in the end, it was revealed that all the Rainbow Monkeys were robot animatronics, and Numbuh 3 and Numbuh 4 were always on Earth all the time. Professor Snuggles & Mrs. Wubsy Tubsy also are revealed as robots.