The Flash Season 2: 12 Big Questions We're Asking After 'Versus Zoom'

12. What, No Mention Of The Supergirl Crossover?

Although the second Flash episode to air since the crossover with Supergirl, this was the one that takes place after it in the show's timeline. We even get to see the setup, with Barry running faster than ever before thanks to the Tachyon device, and disappearing through a breach and back in the space of a second.

It's subtly addressed when he asks "how long was I gone?', but it's never explicitly mentioned, nor does it seem he was actually away at all on Earth-1 time. Although they had more pressing matters, it still seems a little strange that he travelled to another Earth, met someone with powers arguably greater than his own, and doesn't mention it to Cisco and Caitlin.

Also, if the Tachyon device allows him to run fast enough to travel between dimensions, couldn't they have used that to get back to Earth-2, especially if Cisco didn't want to do it?