You had me at MKUltra. The Project BRKN-Shackle campaign setting recontextualizes FIST as a 60s spy thriller rather than the default 80s Cold War mercenaries.
There are new rules for unlocking powers with – ahem – certain substances, a mission generator, new traits, the works.
Plus, I’m pretty sure it opens with a Grade-A Dad Joke:
It’s the middle of the twentieth century and Cold War tensions are at an all time high.
*slow clap*