This episode of the Flash builds off of the previous episode where they finished building a weapon to trap Savitar. At the end of the episode they realized that they needed a power source stronger than the sun to power the weapon.
I always enjoy episodes of the Flash that have crossover from other arrowverse shows. This episode had plenty of that with Barry and Cisco meeting with John Diggle’s wife Lyla about using a power source that they had stored at Argus. This power source just happened to be from when the Dominator aliens attacked during the crossover episode.
I also enjoyed seeing Captain Cold come back to the flash after being on Legends of tomorrow last season. It was interesting to see the hero version of Captain Cold interact with the Flash instead of the villain version that had interacted with him in the past.
I liked finally getting to the point in the future that the Flash had seen happen so many times. I was surprised by the ending and that they weren’t able to prevent it. I think it will be interesting to see how the show goes forward in the finale and next season.