He's not just any alien. The Dec. 2 episode of Marvel's Agents of S.H.I.E.L.D. will finally reveal that its mysterious blue man from outer space — the one whose rejuvenating blood saved the life of Director Phil Coulson (Clark Gregg) — is a member of the humanoid Kree race. Yes, that's the same alien species that gave us Lee Pace's character, Ronan the Accuser, in the Marvel movie blockbuster Guardians of the Galaxy. But all this means bupkis to Coulson and his S.H.I.E.L.D. team.