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Greg Grunberg

  • Then: Grunberg played Ben's roommate Sean Blumberg, his charm parlaying him a bigger role as the series went on.
  • Now: Grunberg would go on to collaborate with childhood friend Abrams multiple times after Felicity, with roles in Abrams's projects Alias and Lost. He was also a series regular on Heroes, and appeared in last year's satire Big Ass Spider. No word yet on whether he will be in the rebooted Heroes Reborn cast, though.

Source: ABC, Epic Pictures Group