The upcoming “Big Bang Theory” spinoff “Stuart Fails to Save the Universe” has several alums from the OG series on the cast — but some of them are playing new characters.

Ryan Cartwright and Josh Brener will play Kyle and Trevor, respectively, on “Stuart Fails to Save the Universe.”

Both actors previously popped up in “The Big Bang Theory,” which aired on CBS from 2007-2019. Cartwright played Penny’s (Kaley Cuoco) classmate in episode 8 of season 6, and Brener appeared in two episodes — episode 10 of season 5 and episode 16 of season 6 — as a comic book store employee named Dale.

Cartwright and Brener are billed as recurring characters on “Stuart Fails to Save the Universe,” but even some of the spinoff’s main cast members had only small roles in the original series. John Ross Bowie (

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