Top Ten Alien Species in the Marvel Cinematic Universe

Example: Thanos. He's probably the only one left, the Mad Titan, since their homeworld has been destroyed anyways. But he is a strong example of what a titan really is.

Example: Ego, terraformed and created several planets in his own image.

Example: Daisy Johnson from Agents of S.H.I.E.L.D., humans who were experimented on with alien DNA (usually from the Kree)