Oliver wakes up to a life in which his parents are still alive and he is about to marry Laurel; Felicity faces a new threat with the help of The Flash and Supergirl.

Arrow celebrates its 100th episode as part of the 4 night crossover “Invasion” event. The result is a bit mixed overall, but it’s entertaining. For those that missed last night’s The Flash, there’s aliens who are up to… something, and at the end of the episode they abducted some of the heroes.

This episode is interesting in that it uses the bigger picture story, but doesn’t get to caught up in it. Instead it celebrates the history of the series taking us through the years in its own version of “Flashpoint.”

In this shared dream world Oliver and crew live different lives where Ollie is marrying Laurel, Diggle is the Arrow, and everything is kind of… normal. The different take on folks is kind of cool and it’s a nice “what if” riff on everything about the series. Seeing each character awaken is entertaining as well, especially what triggers them.

But, what’s really special is all of the guests that show up in the episode. Villains from the past as well as friends and family are all on board in a celebration of the last five seasons. They kept it all under wraps which is even more impressive and for folks who have watched the series, they should be happy with the touch of nostalgia.

There’s some things that don’t quite work as everyone wakes up and the story takes a hard sci-fi spin. I don’t want to ruin it, but the special fx work against the episode at this point and it just doesn’t feel like Arrow. But, the point is to bridge to the next chapter which is on the next day.

This episode works some and fails in some ways, and it’s not as strong as The Flash‘s entry, but better than Supergirl’s. With one more to go in this event, it feels like there’s a lot still to wrap up, but so far, it’s been a fun ride.

Overall rating: 7.85