It was “Man” that screwed himself over in The Garden of Eden. If there is life in outer space they no more need The Gospel than horses or birds do.
Yes, salvation history and the incarnation was directed to man, and man's original sin. We don't know how that would play out elsewhere. If members of other worlds are unfallen, they need no redemption, and if they are fallen, then we best not make assumptions about how Our Lord chooses to do it.
Other worlds could well be redeemed through us as the Gentiles were redeemed through Israel. Or they could be redeemed in a wholly different manner. Too early to tell yet.
On the other hand, you got: "at the name of Jesus every knee should bow, in heaven and on earth, and under the earth . . . " (Philippians 2.10) It might not matter whether the species is homo sapiens as much as whether it is rational, capable of perceiving the Good and able to choose otherwise and has become (in, I believe, Walker Percy's phrase) discontinuous with the Divine, and therefore will, as much as (if not more than ) Man need redemption--all of physical creation will be in need of redemption, which is held to have been accomplished in the death and resurrection of Christ.
Just supposing, of course, and not attempting to establish an argument for extraterrestrial evangelization.
But maybe those supposed flying saucers are full of religious pilgrims, coming to see the planet where God was born, suffered, died and was resurrected as a finite being like themselves (and us), as told to them by their prophets.