A man is violently stabbed in the stomach multiple times. He eventually bleeds out and dies. Blood pools on the floor.
Katie places one of her villains on a workbench. She then puts his testicles in a clamp. As part of her revenge, she tightens the clamp continuously until the testicles explode.
The majority of the second half of the movie is Katie getting revenge on the people who imprisoned and raped her. That includes multiple forms of torture and violence.
A woman tasers a man's face.
A man fights with a woman before subduing and raping her.
A woman is raped in a dungeon.
A man urinates on a woman.
A woman hits a man repeatedly in the head with a trash bin.
A woman is attacked with a cattle prod. The man using it puts it all over her body, including shoving it in her mouth and using it on her vagina.
A man punches a woman repeatedly in the face.
A woman grabs a man by the throat with a choking collar. He is later shown tied to a wall. She cuts his face, stomach, and thigh with a knife before smearing feces on the wounds.
A woman kicks a man in the face after drugging him. She shoves his head into a toilet, drowning him.
A woman shoves a metal wire into a man's throat; blood spews out of his mouth as the wire goes in. She then electrifies both the bed he is on and the wire, killing him.
A man's testicles are electrocuted.
A woman is pushed down a hole and trapped in a box.