Don’t expect a straightforward timeline, because continuity is a mess with the Alien and Predator timelines (even if, as in this list, you choose to ignore tie-in comics, novels, and games). Predator: ...

No discussion of UFO lore is complete without a mention of the supposed alien vessel that crashed on the outskirts of Roswell, New Mexico in the summer of 1947. Was it a fallen weather balloon as the ...