The Flash: 10 Major Predictions For Season 3
7. A Trip To Earth-3
So far, the farthest Team Flash have travelled in the multi-verse is Earth-2, but there plenty others out there (another 50, in fact). One of these is Supergirl's universe, since Barry himself went there by mistake, but we don't know which Earth that is.
One Earth we do know about is Earth-3, because that's where Jay Garrick - the real one, not the Hunter Zolomon/Zoom version - is from. What we also know is that Garrick (as played by John Wesley Shipp) is going to be back in Season 3, despite going home to Earth-3 last year.
While Garrick will return to Earth-1, there's little point establishing the multiverse - and more pointedly his home world - without the possibility of some day exploring it. Earth-3 from the comics is home to the Crime Syndicate of America, and it'd be great fun to see something like that play out.
The showrunners haven't shied away from giving fans big comic book-y moments, so it wouldn't be a surprise for an Easter egg-filled trip to Earth-3 to take place.