I was going to say Geena Davis, you beat me to it Geena is fantastic in everything, she is one of my favourite actresses.
Dianne Wiest went from movies to Law and Order (then back to movies). I know there are several others, every now and then I watch something and I'll see a movie actor in a TV show, but of course I can't think of any now.
Started in movies, became known for his role in three of the "Frankenstien" films. Later hosted his own show, "Boris Karloff's Thriller" and provided the narration and voice for the title character in the tv version of "How the Grinch Stole Christmas".