I absolutely love this show, but every once in a while it punishes those who do not watch the other shows in this "universe" (this time much worse than any before). I am not generally a fan of super hero TV shows or movies, but the time travel aspect got me interested and then I got hooked. I am not going to watch the other shows in this "universe", I have tried and just can not get into them. I wouldn't mind these crossover episodes if they let viewers know what was going on and gave some backstory for those of us who don't watch the other shows that the crossover combines with....to those of us left in the dark, this episode felt like a fever dream. The sad part about this is the community will downvote this review more than upvote it, even though I am right and the writers should have done more to fill in the blanks to those not familiar with the other shows.