This tall, good-looking romantic leading man became a heartthrob during his three-year (1978-81) stint playing out-of-work actor Bobby Wheeler on the ABC sitcom "Taxi", then left the series to pursue other opportunities and often found himself unemployed as well. Jeff Conaway had looks and a lot of energy and had been acting since his youth, but by the 1990s was reduced to playing in direct-to-video films, while returning to his glory by starring in the latest revival of "Grease" on Broadway. He did find some stability portraying security chief Zack Allan on the syndicated sci-fi series