Jonathan Matthias, also known as Brother Matthias, is the main antagonist of the 1971 science fiction horror film The Omega Man, a film adaptation of Richard Matheson's novel I Am Legend. He is the leader of a cult of undead humans in a post-apocalyptic Los Angeles.
He is portrayed by Anthony Zerbe, who also portrayed Milton Krest in the James Bond film Licence to Kill, Helmut Kellerman in Mission: Impossible, and Arnie Grunwald in Tales From The Crypt.