An experimental television play composed of excerpts from his novels and stories, Between Time and Timbuktu features Kurt Vonnegut's special blend of scientific expertise, wit, and penetrating comment.   "Most unusual, ultra imaginative . . . a sort of cross between 2001: A Space Odyssey and Alice in Wonderland."--Philadelphia Inquirer The basic story line: Young Stony Stevenson wins a jingle contest and, as his prize, is blasted off into the time-space warp. The country's first poet-astronaut thus experiences both past and future human history simultaneously. His observations on it consist mainly of dramatized selections from the author's works. The result is a unique Vonnegut sampler cast in the form of "an excellent drama" (Pittsburgh Press).