Here comes the list :)
Benedict Cumberbatch
Zachary Quinto
Zachary Levi
Robert Downey Jr
Joshua Gomez
Chris Pine
Tom Hardy
Alan Rickman
Daniel Radcliffe
Rupert Grint
That's all I can think of right now but there's definitely more!
Zachary Quinto.. unlikely?
Zachary Levi
Joshua Gomez
Johnny Galecki
Jim Parsons
Simon Helberg
Anthony Head
Alyson Hannigan
Emma Caulfield
Amber Benson
Danny Strong
Tom Lenk
Eliza Dushku
Harry Groener
Alexis Denisof
Julie Benz
Nathan Fillion