Shifting Gears broke up Tim Allen and Jenna Elfman's characters - but is there a chance they could rekindle their romance? The ABC series marked the first time Allen has starred on a sitcom where his character isn't married. (Allen's characters on hit sitcoms Home Improvement and Last Man Standing were already in committed relationships when each series began.) "From the very beginning, [the creative team has said] that we've never seen Tim Allen in a sitcom with a romantic interest. And I said, 'Well, I've just lost my wife on the show, so I don't see it.