Clayface ending explained: Matt's deadly revenge and his delusional sewer romance

The ending of Clayface is insane, and it's extremely dark. Matt spends the back half of the film using his shape-shifting powers for revenge, and even when it looks like he's finally been destroyed, the last scene shows he's still out there and still obsessed. Spoilers ahead if you haven't seen the movie yet.

Matt turns his shape-shifting on the mobster's men

Throughout the second half of the film, Matt uses his shape-shifting abilities to take out his best friend and anyone who has crossed him among the mobster's men.

The best part of the movie, to me, is when Matt infiltrates the nightclub party where the mobster and his men are gathered. He switches between the mobster's men, using his shape-shifting to kill every single one of them. He fools everyone else in the club too, because no one knows it's him.

After slaughtering the bodyguards, Matt kills the mobster's lover, who tricked him earlier in the film. Then he murders the mobster himself by bleeding nano cells onto his face.

His fixation leads to a confrontation and the kill switch

Matt is consumed by a possessive fixation on the woman at the center of his obsession. He also wants to silence the police investigation into his killing spree. So he visits her home after taking over the body of another man. She then discovers that man's corpse in the next room.

That's when she finds out it was really Matt all along. Horrified, she shocks him with a taser. As Matt turns into Clayface's true form, she presses the emergency kill switch button. His monstrous body dissolves into a puddle of sludge that washes down into the Gotham sewers.

The final scene reveals Clayface may not be dead after all

We're led to believe Matt and Clayface may be dead for good, but the closing scene shows that isn't true. She's walking around, and she seems to think people are staring at her. A homeless man asks her for a dollar.

We then see him walking into the sewers and opening a door, and it's really Matt. He morphs into her and himself at the same time and has a conversation that's almost like a hallucination, because it's what he wishes had happened.

We may think she followed him into the sewer. Then it's revealed he's completely alone. He has molded a physical replica of her out of his own clay body as he acts out this delusional romance. He still has an obsession with her. Then we see Clayface in his full form, and the movie ends.