The Mad Hatter - Earth ???? - Suicide Squad: Kill Arkham Asylum

Following the reconstruction and opening of Arkham Asylum, under A.R.G.U.S. control, the Mad Hatter was among the inmates detained there. 

When Amanda Waller organised an impromptu Battle Royale to determine which inmates had the best chance of serving TFX, he was among the many released from his cell. 

He teamed up with Captain Boomerang, Crazy Quilt, Spellbinder, and Hypnotic and attempted to escape from Arkham, only to be trapped in a room with Condiment King and forced to fight to the death. 

Hatter attempted to trap Harkness in an illusion, but Boomerang saw through it and killed Tetch, impaling him with a boomerang.