And in a clash of the fandoms, he was even spotted chatting with Orphan Black's  Tatiana Maslany. Get them on a panel together to talk acting, Comic-Con!
Source: Vine user delblogo 
So we might not see him on the giant Hall H stage this year — there were these fan sightings, and we'll also take the epic video memory of Matt walking 2013's convention-center floor dressed as Bart Simpson. Please watch and enjoy below.