Stuart Fails to Save the Universe is still missing 3 major Big Bang Theory cameos after 4 episodes — but creators claim that returning cast are simply 'who was available'
Clearly some things are just a case of timing
by https://www.techradar.com/uk/author/jasmine-valentine · TechRadarFeatures By Jasmine Valentine Published 14 August 2026
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Mild spoilers for Stuart Fails to Save the Universe episode 4 ahead.
Four episodes into Stuart Fails to Save the Universe on HBO Max and we've seen four surprise Big Bang Theory characters return: Raj (Kunal Nayyar), Penny (Kaley Cuoco), Bernadette (Melissa Rauch) and Amy (Mayim Bialik).
With one new face per episode, you might be wondering whether the remaining six episodes in the series will continue the trend.
Most notably, Sheldon (Jim Parsons) and Leonard (Jonny Galecki) have yet to make an appearance — and considering they built the machine that Stuart (Kevin Sussman) broke that got him into this mess, it feels fitting that they should reappear.
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However, a return isn't necessarily guaranteed, especially if the creators want Stuart Fails to Save the Universe to be picked up for a second season (which they definitely do). Why give us what we want now if they can drag it out?
But after speaking to Chuck Lorre, Bill Prady and Zak Penn, it turns out the reason for the season 1 cameos is actually boringly straightforward: it all came down to who was available to film.
It needed to serve the storytelling
"It was availability and what was necessary for the storytelling" Lorre responds when I ask him about this season's cameos. "It was wonderful to have Melissa play a demonic character, for example. That just made sense."
Penn adds "Who we had something good to write for," with Prady agreeing "I also loved finding out that Amy is married to Golden Age Flash. That made me very happy."
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