DC’s building up to the Arrowverse’s highly anticipated Crisis on Infinite Earths crossover event, and it looks like a few major DC names may be making appearances.

According to a report by Cosmic Book News, a source at San Diego Comic-Con International revealed two major cameos in the Arrowverse crossover, making the event much larger and much more exciting than fans would have expected. Not only will the Crisis on Infinite Earth’s crossover event feature Brandon Routh’s superman, but the publication says that Smallville’s Tom Welling will also reprise his role as the young Man of Steel.

Not only that, but 70’s Wonder Woman legend Lynda Carter is also reportedly being brought in to play Wonder Woman. Though the actress already appeared in a few episodes of the CW’s Supergirl series, Carter never really got to return to the role. Now, the report says she’s going to be appearing as Diana Prince.

This is definitely big news. Welling and Carter have made significant contributions to the DC live-action franchise, and it’s been years since we’ve seen them play the roles that DC fans remember them for. Of course, this can only be made possible by the Crisis on Infinite Earths event.

For those who aren’t familiar with the event, Crisis on Infinite Earths featured a catastrophe that affected multiple planes of the universe, destroying countless parallel universes while recreating a single positive matter universe (and an antimatter universe). It’s a major comic book event, one that covers many, many different iterations of everyone’s favorite DC superheroes. We’re hoping that The CW manages to pull it off.

Crisis on Infinite Earths launches sometime in December on The CW.

Read: Brandon Routh's Superman is Coming Back for CW's Crisis on Infinite Earths