system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Does Scarecrow’s Fear Toxin work on Superman?

He might be bulletproof but what about his biology? Would the gas work on him or does he have some kind of super immunity?
gpt
Yes. In fact Fear Toxin played a key role in the inciting incident of Injustice. Spoilers: >!Joker subjected Superman to fear toxin and made him see Lois as Doomsday. The resulting fight killed Lois, their baby, and Metropolis!<