I was just thinking that we could incorporate a few aliens into the expedition if you can think of a good way to justify them being included.  I don't know how believable it is that Rann(sp) or Oa sent someone to join us, but we could include a metahuman we meet when we arrive on Earth as a guide if someone wants to play one.  We could also awaken a single Kryptonian leader to help decide on the planet the refugees will be sent to.  Maybe a reimagined Supergirl?  If we did that, though, they would be limited in strength to never get stronger than a Veronian.  We'll say that they are still sick from the cryostasis, or they are just now being exposed to yellow sunlight and learning their powers, or something similar.