Doctor Horrible was spotted at this weekend's rally in DC announcing his credentials via sign. But whose side is he on: Jon Stewart's Rally to Restore Sanity or Stephen Colbert's March to Keep Fear Alive? Updated with more scifi-themed signs!

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Dr. Horrible via Maurissa Tancharoen.

Update: Reader Mary R. just sent in tons more scifi-themed posters and outfits from the rally. Thanks, Mary!