Van Gelder is a volunteer worker for the Tantalus V. Observatory who appeared in the Season Two episode, "Roger Ebert Should Lay off the Fatty Foods".


In "Roger Ebert Should Lay off the Fatty Foods", after being hypnotized into working at the Planetarium, he manages to escape via the school bus. He informs everyone of Dr. Tristan Adams' plans. He is very unstable due to his hypnosis.


He wears the standard Tantalus V. Observatory uniform; a black shirt, with a light blue v-neck shirt and a picture of a dark cloud and sun.


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