Dr. Cockroach is a fictional character from the animated film series Monsters vs. Aliens. He is a brilliant scientist who was transformed into a cockroach after a lab accident. Despite his insect form, he possesses advanced intelligence and a knack for inventing gadgets. In the series, Dr. Cockroach serves as a member of a team of monsters who work together to protect Earth from various threats. His character is known for his quirky personality and humorous dialogue, making him a memorable part of the Monsters vs. Aliens franchise.