When this sitcom about outer-space aliens in Ohio premiered in '96, skeptical earthlings didn't expect it to outlast the invaders in War of the Worlds. But Mars doesn't have actors with John Lithgow's high-beam theatrical energy. He preens, yowls, slithers—and that just gets him in the door. The show lasted six seasons, and it's still funny. Extras? Not out of this world: bloopers, interviews.