Rip Hunter is a time lord from the future who’s in charge of keeping the timeline intact. But when his family is murdered by Vandal Savage, right after he takes of the world, Hunter goes back in time 150 years to the modern day to recruit heroes and villains alike to help him on his quest for wiping out Savage.
When he essentially kidnaps Firestorm, Hawkman and Hawkgirl, Captain Cold and Heatwave, along with Sara Lance, he tells them that in the future, they are all legends in his time, hence the name of the show. Because Rip does this specifically to screw up the timeline, they begin to be hunted by a sentinel of the Time Lords known as Chronos. They find out that Chronos is very Cross with them. They seemed to have found Chronos’ Trigger. Okay, I’ll stop.
There’s something beautiful about the “twist” that Rip takes them in telling them they’re not actually legends in his future but instead are chosen purely because they don’t matter to the timeline at all. They’re nobodies, and this group of nobodies is going to save the timeline, often screwing things up in the process.
Truthfully, the Legends are such screwups already at the start of the show, it’s a wonder the writers didn’t realize that this was destined to be a comedy from the outset. Instead they’re trying to make the drama stand out but it’s hard with so many superhero-based dramas in the Arrowverse already.
+7.5: A solid setup for what eventually becomes a real gem in the Arrowverse, takes a bit to get there but this episode isn’t bad by any means
-1: they spend too much time talking about whether they want to be time traveling superheroes or not
+1: The action is solid and doesn’t slow down (much)