What a fun episode. This is what I was expecting to get with the arrival of Jay Garrick into Barry's Parallel Earth. What I didn't expect to see is him without his powers and I liked how they were able to improvise at the end to make it appear he still had his Speed. Sand Demon was kinda cool. Too quick of an appearance to really get much out of it though. His character is very similar to that of Sandman. Was wondering how they were going to 'write off' Dr. Martin Stein from The Flash and get him ready for Legends of Tomorrow. Having him drop at the end seems like the start. Best part of the episode was of course the epilogue that took us to Jay's Parallel  Earth and seeing Dr. Harrison Wells. Yay! Did I tell you that this is going to be a fun season?!