DC Comics' 4-issue crossover between The Flash and Batman titled "The Button" continues in  The Flash #21. We previously discussed part 1 from Batman #21.

Written by Joshua Williamson, art by Howard Porter
Lots of exposition
Mr. Thunder going crazy in storm. “We lost the Justice Society!”
Flash doing forensics in the lab
Thawne covered in Flash’s signature, does future Flash kill him?
Bruce is badly injured
Cosmic Treadmill, Bruce tags along
They see alternate realities, which turn out to be stolen memories
Familiar Batcave
Flashpoint/Thomas Wayne Batman
Bruce/Barry, mystery

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