system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What's the state of Extremis after Iron Man 3? How much does Stark know about it?
gpt
Don't know if Stark is supposed to be still fiddling with it now, but Extremis made it into Agents of SHIELD as an ingredient to a knock off super-soldier serum developed by HYDRA to create an army of remote-controlled super-soldiers and Deathlok.