So, a pocket dimension outside of all our timelines.

[She knows she's finishing his thought for him. It's something they've always been able to do with one another. She does it with Curtis and Cisco too. Basically the curse of being a genius in a room full of them.]

So basically this could be 'The end of Time' but, you know, real. Which means we'd have to find the original anomaly. Which, so far, are none of us, unless someone altered a fixed point in time. What time is it?