Hmm, Classic Who - Carole Ann Ford, Angela Bruce, Marcus Gilbert, Colin Baker, Janet Fielding, Ben Aaronovitch, Andrew Cartmel, anyone from HP, really, Warehouse 13 - Allison Scagliotti, Eddie McClintock, Saul Rubinek, Genelle Williams, Kelly Hu, anyone from Star Trek: Voyager (cough Kate Mulgrew and Jeri Ryan cough), Rick Riordan, anyone from the Avengers cast.