Next gallery »17 people you can't believe hosted 'Saturday Night Live'
« Previous galleryMeet the 'Survivor' Season 30 cast
Tenure: 1976-79; 1981-1984
O'Hara was Gilda Radner's understudy in Toronto's Second City stage troupe before getting a TV platform on "SCTV," where she became the series' most prominent female cast member thanks to a number of popular recurring characters including emotionally volatile Las Vegas showgirl Lola Heatherton and foulmouthed nightclub comedian Dusty Towne. She was actually cast on "SNL" during the show's 1981 retooling but parted ways before ever appearing on air, choosing instead to stay with "SCTV" after the latter series was picked up by NBC. The move certainly didn't hurt her career; though she was never a leading lady, O'Hara's big-screen resume includes Martin Scorsese's "After Hours," Mike Nichols' "Heartburn," Tim Burton's "Beetlejuice" and the 1990 blockbuster "Home Alone," not to mention all of Christopher Guest's big-screen improv comedies.