Chris Hemsworth participates during a Q&A panel on day three at the Ace Comic-Con at the Donald E Stephens Convention Center on Sunday, Oct. 13, 2019, in Rosemont, Ill. (Photo by Rob Grabowski/Invision/AP)
“Spiderhead” is about inmates in a state-of-the-art penitentiary run by a visionary (Chris Hemsworth) who experiments on his subjects with mind-altering drugs.