It is what's known as a nexus event. In which, an occurrence within a timeline that was not supposed to happen and when somebody falls off the path he or she was meant to follow. That is exactly what happened to Natasha when Thanos snapped his fingers, and in those five years, the last thing she ever expected was for her to be pulled into an strange world with not only strange supernatural occurrences, but also finding herself falling for the worst one of them all, Klaus Mikaelson. The Vampire Diaries - #1 hybrid - #675 tvdu - #3 Alternate Universe - #11 Crossover - #6 Avengers - #5 Takes place in season 3 of tvd. [Crossover - Mcu x Tvdu] Niklaus Mikaelson x Natasha Romanoff *Disclaimer* I do not own Marvel or tvdu, I only own certain plot lines.