Garry Shandling ("The Larry Sanders Show") doesn't think he's reached his potential as a comedian. "Maybe I'll do standup again," Shandling told PEOPLE Daily contributor A.J. Flick. "I've been toying around with that idea." Shandling plays an amorous alien in "What Planet Are You From?," which Mike Nichols directed from Shandling's script. (The movie opens in March.) Does Shandling believe in aliens? "I live in Hollywood, so I have to." In the film Shandling, an alien, marries Annette Bening, but real-life wedded bliss has eluded Shandling, 49. "It's really to the point now, when I envision myself walking down the aisle with a woman in white, it's a nurse."