One of the first cringe-worthy episodes in a long time that has Barry running around Central City at many times the speed of light.
The vast majority of the episode supposedly takes place in the 5 nanoseconds between the start of an uncontrolled fission reaction (i.e., a nuclear explosion) and the effects expanding beyond the nuclear material. During that time, Barry runs many miles and stops to have conversations that take minutes of screen time. This shows "Flashtime" is effectively trillions of times faster than real time.
The real problem with the episode is it destroys the entire series, since if Barry can move that fast, he can literally move faster than anything any villain can come up with, and not using "Flashtime" to defeat every villain means that Barry is being incredibly stupid.
So, if you like the series (as I do), just pretend this episode never happened.
The vast majority of the episode supposedly takes place in the 5 nanoseconds between the start of an uncontrolled fission reaction (i.e., a nuclear explosion) and the effects expanding beyond the nuclear material. During that time, Barry runs many miles and stops to have conversations that take minutes of screen time. This shows "Flashtime" is effectively trillions of times faster than real time.
The real problem with the episode is it destroys the entire series, since if Barry can move that fast, he can literally move faster than anything any villain can come up with, and not using "Flashtime" to defeat every villain means that Barry is being incredibly stupid.
So, if you like the series (as I do), just pretend this episode never happened.