The Multiverse of Rebooted Nostalgia HBO Max's "Stuart Fails to Save the Universe" has been exploring the multiverse in its latest season.
One notable example is Kaley Cuoco's surprise cameo as an alternate version of Penny in Season 1 Episode 2.
The introduction of alternate versions of familiar characters is a trend that has been seen before, notably in the Marvel Cinematic Universe's handling of Thanos' snap.