Jack Baker is one of the primary antagonists of Resident Evil 7: Biohazard.
Jack is a middle-aged man who is the head of the Baker family, the husband of Marguerite, and the father of Lucas and Zoe. Jack sets him up to have a macabre dinner with the rest of the Baker family. He relentlessly pursues Ethan Winters using a variety of weapons and is able to survive grievous bodily harm, even after being set ablaze when a car bursts into flames inside a garage or being hacked into pieces by a chainsaw. To prove to Ethan he is no longer a normal human being, he also takes his gun and seemingly dies after blowing his own head off, only to rise again and continue pursuing Ethan. Jack also brutally murders a policeman who had come across Ethan after they entered the garage.
Ethan defeats Jack one last time after he has mutated into a large grotesque creature, by injecting the creature with a serum meant to neutralize Eveline's powers and influence in others, which calcifies the creature in the process. Jack later appears to Ethan in a dream like sequence as a seemingly normal man, with Ethan acknowledging his victimhood by Eveline along with the rest of the Bakers.
Jack returns as a major enemy in End of Zoe which is a downloadable content chapter that takes place after the main game. His poisoned cells mutating out of control, Jack reconstituted as a decayed but near invincible creature nicknamed the "Swamp Man" acting on his own accord following Eveline's death. He stalks after Zoe and abducts her from his estranged brother Joe Baker who tries to cure her, with Joe eventually killing Jack for good with the AMG-78 gauntlet completely obliterating his upper body.
Jack appears as a playable character in the upcoming 2021 multiplayer game Resident Evil RE: Verse, which is a companion game to Resident Evil Village.