Quick recap
Sara is abducted by aliens just before proposing to Ava. While Ava and the Legends hunt aliens loose in history, helped by Spooner, who can sense them, Sara learns her captor is Bishop, a scientist from the future who clones Ava. Sara dies and comes back in a clone body with alien DNA that regenerates. Constantine loses his magic and chases the Fountain of Imperium to get it back. Mick finds out he's going to be the father of alien babies with Kayla. In the end, the invaders are beaten, Mick's eggs hatch and devour Bishop, and Constantine, damned again, goes his own way. Sara and Ava move up their wedding, but a second Waverider appears and destroys their ship, stranding the team in 1925.
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