The Knave of Hearts is a major antagonist in the 2010 movie Alice in Wonderland. He was played by Crispin Glover.
Alice in Wonderland
The Knave of Hearts (called Ilosovic Stayne in the film) is first seen obtaining the Oraculum and taking it to The Red Queen as he shows her Alice slaying the Jabberwocky. Soon after, Stayne is briefly seen talking Bayard the Bloodhound, getting him to believe that if he found Alice, his wife and pups would go free.
Stayne is next seen talking to The Mad Hatter, The March Hare and the Dormouse, unaware that the Hatter is hiding Alice in a teapot. As the Hatter attempts a random distraction, Stayne threatens that if they were hiding Alice, they'd lose their heads as he chokes the Hatter, who then remarks that they'd 'already lost them'. He releases the Hatter and then leaves as Bayard runs off, pretending to have found Alice's scent.
Later on in the film, Stayne is seen in the hallway of The Red Queen's castle, telling Alice that he likes her, but Alice immeditately turns away from him. One of The Red Queen's subjects overhears this and tells the Queen. She gets enfuriated with Stayne and, when he convinces her that Alice was the one obsessed with him, she screams 'off with her head'. Stayne is then seen attempting to take the Vorpal Sword away from Alice, but is interrupted by the Bandersnatch (who had become friends with Alice after she returned its missing eye). Further into the film, during the final battle, Stayne duels The Mad Hatter and would've been killed by him if Alice hadn't slayed the Jabberwocky and stopped the battle. After The White Queen declares to banish both Stayne and The Red Queen, Stayne attempts to kill The Red Queen, but fails due to The Mad Hatter's interference.
He is then banished from Underland with The Red Queen, pleading for death at the White Queen's hands rather than a life with the Red Queen. He is denied the mercy of death, for the White Queen owes him no kindness. His ultimate fate is unknown.