gilbert, shelbert, norbert, and missy are the four children of filburt and dr. hutchison, who all came from the same egg in the fourth and final season of the show. gilbert and shelbert look exactly like filburt while missy is a miniature version of dr. hutchinson. norbert, on the other hand oddly resembles heffer since he sat on the egg for filburt. he also believes that rocko is his father and constantly follows him around. for most of the series, the four are featured as babies; they appear once as teenagers in the episode "future schlock." gilbert and shellbert were voiced by mr. lawrence, norbert was voiced by tom kenny, and missy was voiced by linda wallem.