The episode will see the Legends head back to the 1980s with a mission that hits close to home. As you can see in the clip below, a young Ray Palmer is found dead and if that particular anachronism is left unchecked it would have dire consequences for the team.
Of course, saving Ray is only part of the story. In the episode young Ray has also made an intresting new friend -- a baby Dominator.
As you might have guessed from the episode's title as well as Ray's new alien friend, next week's episode is a likely nod to Steven Spielberg's classic film E.T. The Extra-Terrestrial, though from the looks of things, the episode has a distinct Stranger Things vibe as well.
Of course, the episode won't be all aliens and danger. It's Halloween, after all, and audiences will get to see little Ray dress up as what appears to be his grown up self, too.
Legends of Tomorrow airs Tuesdays at 9/8c after The Flash on The CW.