Major Monkey

Major Monkey is the main antagonist of the fourth "Ricky Ricotta's Mighty Robot" book "Ricky Ricotta's Mighty Robot vs. the Mecha-Monkeys from Mars". He is the head of the Mecha-Monkeys, who despises living on Mars because it is cold and dry. Because of this, he intends to take over the world.

Later, after his defeat, like every book's previous main villain, he is put in Squeakyville Jail.