MAJOR SPOILERS for Crisis on Infinite Earths Parts 4 & 5 ahead
The Arrowverse's Crisis on Infinite Earths crossover ends with a new multiverse, so here are all DC shows confirmed and what Earths they're set on. Even before the Crisis on Infinite Earths crossover event kicked off last month, there were plenty of indications The CW's franchise would confirm multiple DC properties to be part of the Arrowverse by way of the multiverse. Over the first three episodes, Superman origin Smallville, the 60s Batman show, the short-lived Birds of Prey series, the DC Universe's Titans, Superman Returns and more were confirmed to be in the Arrowverse.
However, many of these alternate universes were destroyed by the antimatter wave that ultimately erased the entire multiverse. Thankfully, Pariah was able to transport the Paragons to the Vanishing Point outside of space and time where they were joined by the Spectre - formerly Green Arrow/Oliver Queen. Together, they began working to defeat the Anti-Monitor and save their worlds. At the end of Crisis on Infinite Earths Part 4, Oliver Queen sacrificed himself in order to reboot the multiverse. Although the heroes' fight wasn't over and they still had to defeat the Anti-Monitor once and for all, Oliver's sacrifice created a new multiverse - one that includes a number of other DC properties.
In a quick sequence toward the end of Crisis on Infinite Earths Part 5, it's revealed that a multiverse is still in tact, and just like on Earth-1, there were a number of changes. Not only are The Flash, Supergirl and Black Lightning's worlds all on one Earth, renamed Earth-Prime, but the other Earths are occupied by other DC TV shows and movies. Of the DC Universe series, Stargirl is set on Earth-2, Titans is set on Earth-9, Swamp Thing is set on Earth-19 and Doom Patrol is set on Earth-21. The sequence also confirmed Green Lantern is set on Earth-12. Lastly, Brandon Routh's Kingdom Come Superman from Superman Returns is set on Earth-96.
There are quite a few changes to DC TV canon here, not the least of which is Titans and Doom Patrol moving to separate universes. The Doom Patrol team originally debuted in Titans season 1 before spinning off into their own show. Now they'll exist in entirely different universes. That'll no doubt help to explain a lack of crossover since, beyond that one episode, the Doom Patrol and Titans teams have stayed entirely separate. Similarly, Swamp Thing was always in a different universe, so it now being set in Earth-19 doesn't come as much of a surprise.
Beyond the confirmations of which Earth each show is set on, Crisis on Infinite Earths also offered a new look at the upcoming Stargirl. Plus, it operates as the first official tease for HBO Max's Green Lantern show, despite the actual footage used being from the 2011 Green Lantern movie. Since the upcoming series has already been confirmed to be in the works, it's more likely this particular sequence in Crisis on Infinite Earths teases that show, rather than confirms the Green Lantern movie to be in this continuity. Since it's still early days on the TV series, the Arrowverse probably reused footage since they have nothing new to show. Very little is known about it, but the series hails from Arrowverse architect Greg Berlanti. Still, now we know why the Green Lanterns may not be called in for the next CW crossover, since they're on a different Earth.
The change to the multiverse that will have the most impact on The CW's Arrowverse is no doubt that all of is shows now take place on the same Earth, Earth-Prime. In fact, we've already seen the Arrowverse assemble its Justice League for the first time in the final moments of Crisis on Infinite Earths. So there's plenty more superhero action to come in the Arrowverse's multiverse after Crisis On Infinite Earths.