The Boys Presents: Diabolical S01E07 "John and Sun-Hee"

An elderly Vought janitor named John learns that his wife Sun-Hee has only days to live before succumbing to pancreatic cancer. In desperation, John steals a vial of Compound V to cure her. After receiving the serum, Sun-Hee recovers and is able to escape with John thanks to glowing tentacle powers emitting from her cancer. As they flee, the cancer leaves her body in the forest where it consumes wildlife and grows. Vought Agents come to destroy it, but the cancer consumes them as well. John wants to flee, but Sun-Hee says they must fix what has happened. Sun-Hee has received powers of her own and she wishes John well, telling him to take care of himself without her. Sun-Hee then goes to battle the cancer alone as the episode ends.