Where did they come up with some of these weird titles?
Perhaps this never-reprinted tale from Ace's Space Action #2 (1952) will clear up some of the mystery...
The "migration" is a minor plot point.Personally, I would've gone with something like "The Outlaw Who Saved the Earth" or "Seek Treasure, Find Death!"
But that's just me.
Art is by Bill Molno, the writer is unknown.