Tarrant Hightopp, also know as The Mad Hatter or simply The Hatter, is a major character from the 2010 film Alice in Wonderland and its sequel Alice Through the Looking Glass. He is a hat maker that has been poisoned by mercury, hence his orange hair. He is part of the resistance to bring down the Red Queen's command of Underland and thus end her bloody rule. He is portrayed by Johnny Depp.