Anyone from the Sanctuary cast (besides Amanda Tapping since she's already announced) would be awesome but my special request is:
Agam Darshi! :) That would make my entire life and she did mention she'd like to go.
Other than that, I would love to meet:
Jonathon Young
Tom Hiddleston
Ryan Robbins
Chris Heyerdahl
Paul McGillion
Emilie Ulerup
Pascale Hutton
Anyone from the Avengers cast