Stephen Hawking (voiced by himself) made a guest appearance in the episode " Anthology of Interest I " as a member of the Vice Presidential Action Rangers (VPAR), who guard the space-time continuum. Along with Hawking at the end of the twentieth century they include Al Gore, Nichelle Nichols, Gary Gygax and their summer intern Deep Blue. He first appears as a customer at the pizzeria where Fry mistakenly believes him to have invented gravity for which Hawking accepts credit ("Yeah, sure. Why not?"). After learning of Fry's inter-dimensional experience, he arranges for him to be kidnapped by the VPAR.