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The Big Bang Theory spin-off wanted a Green Lantern for its surprise DC crossover episode, but the HBO show prevented it
The Big Bang Theory spin-off 'Stuart Fails to Save the Universe' featured a DC Universe crossover with The Flash appearing as a replacement for Green Lantern. Co-creator Zak Penn revealed that the show was denied permission to use Green Lantern due to existing plans for the character, leading them to pivot to The Flash. DC Comics, including Jim Lee, provided notes on the characters' appearances.