All brilliant actresses but maybe not as well remembered as the big names as they were never leading ladies. Actually I think Agnes Moorehead will be remembered more than most, but because of "Bewitched" rather than her film work.
Chester Morris (Boston Blackie)
Richard Dix (The Whistler)
Andy Devine (Early cowboy star)
Barry Sullivan (The Gangster)
Dan Durea (Bad guy)
Silvana Mangano (The legs in Bitter Rice)
Ruby Keeler & Dick Powell (Early musicals)
Leo Gorcey (Bowery Boy)
Pat O'Brien (Tough guy)
Plus many more slowly slipping into obscurity.