The 1960s, man. It was a crazy time — especially for ex-vampire-experimenting lab assistants. In Season 5, Episode 19 (“Man on Fire”) of The Vampire Diaries, we’ll flashback to the 1960s to meet Maggie (Heather Hemmens), the former Augustine Society research assistant with whom Enzo (Michael Malarkey) fell in love. Question: Why is this character important enough to warrant her own flashbacks? Answer: We don’t know — but that doesn’t mean we’re not going to put our best educated speculation on it! What happened to Maggie?

The synopsis

Before we dive into theories, here’s what we know from the official synopsis for the episode: “Through flashbacks to election night, 1960, Enzo reveals to Elena, Stefan and Bonnie that he has learned what happened to his long-lost love, Maggie, and then, with the unwilling help of Liv and Luke, things take an ugly turn. Trying to calm Enzo down, Damon intervenes, but his words cause Enzo to make a desperate and dangerous decision that leads to a violent confrontation with Stefan.”

Theory #1: Maggie died, but will be back from the Other Side

TVD concerns itself with exploring the different degrees of living, dying, and the spaces in-between. And it sounds like the show will only up the ante on these themes as Season 5 comes to a close, exploringthe disintegration of the Other Side and what that means for the characters who have loved ones there. We think Enzo might be one of those characters. Because isn’t that more interesting? If Maggie died as some kind of supernatural in the 1960s, then she is most likely currently hanging in supernatural purgatory along with almost everyone else who has died on this show. Does Enzo force Luke and Liv to bring her back in the same way that the Travelers brought Markos back from the Other Side, perhaps using Stefan and his doppelganger blood as a power source? Is this the “violent confrontation” of which the synopsis speaks?

Theory #2: Maggie is a Traveler, inside of someone we already know

Word on the street is that the Travelers have already infiltrated many of Mystic Falls’ finest as Passengers. Could Maggie be one of those Passengers, living her life in someone else’s body? It makes sense that she would be a Traveler. This would explain why the Travelers know what happened to her, as well as the possible reason for Maggie’s work with the Augustine Society. As evidenced by Sloan’s initial approach of Dr. Wes and the Travelers’ offer to fund his vampire experimentation, the group of nomadic witches have an interest in the vampire-experimenting society’s work and have kept an eye on their research. Did this begin or at least continue with Maggie’s placement in the Society? Did she infiltrate the group to find out if they could help the Travelers break the curse that had been put upon them, only to quit when she started to develop feelings for Enzo? (Because, really, who wouldn’t?)

What do you think happened to Maggie? Share your theories in the comments below!

Catch the next episode of The Vampire Diaries on Thursday, April 17 at 8 p.m. ET on the CW.

Kayti Burt is a contributing writer for Wetpaint Entertainment with a penchant for all things pop culture. Follow her on Twitter and Google+!