Prisoners of Gravity was a Canadian public broadcasting television news magazine program that explored speculative fiction — science fiction, fantasy, horror, comic books — and its relation to various thematic and social issues. Produced by TVOntario, the show was the brainchild of former comic retail manager Mark Askwith and writer Daniel Richler, and was hosted by Rick Green. The series aired 139 episodes over 5 seasons from 1989 to 1994..