Board Thread:General Discussion/@comment-8505655-20130522223606/@comment-4969948-20130525022058

I would say Fasttrack and/or Eatle might have been possible new aliens he unlocked, along with obviously Lodestar. Ben didn't seem surprised to be turning into them in Ultimate Alien, and we don't know of their whereabouts off-screen...so it could be possible he gained them in Alien Force and used them off-screen.