Monster Name: Ginormica From California. She grew to a massive size after coming into contact with a meteorite, and her brown hair turned silver in the process. Since her transformation, she wears a specialized suit. She struggles to accept herself as a monster and longs to return to her happy life with her fiancé as an ordinary woman.

A one-eyed monster born by accident during an experiment at a food factory where a genetically modified tomato was crossed with a chemically altered dressing. His body is made of a translucent blue gelatinous substance that is absolutely indestructible. He has a voracious appetite and can digest anything. Extremely optimistic and a bit of a goofball. His full name is Benzoate Ostylezene Bicarbonate, or B.O.B. for short.

A cockroach-man born from a machine malfunction during an experiment to integrate cockroach resilience into human DNA. He is highly intelligent and creative as an inventor, though he insists he is not a mad scientist. He loves rotten food. While he is usually busy with research, his true specialty is actually dancing.

A prehistoric creature—half-ape, half-fish—who was frozen during the Ice Age while evolving into a primitive human and thawed out after many years. He was captured while scaring tourists at a beach resort development.

Originally a small insect, he grew to 100 meters tall after being exposed to radiation. He was captured while destroying skyscrapers in Tokyo. He cannot speak and only makes cries or growls, but The Missing Link seems to understand what he is saying.

An alien plotting to invade Earth. Possessing superior scientific technology, he torments humanity and the monsters with various schemes, including the use of a giant alien robot.

W.R. Monger The officer in charge of the secret base where Susan and the other monsters are held.

The current President of the United States. Weak-willed and unreliable, he only learns of the monsters' existence during this crisis.

Derek Dietl Susan's fiancé and a TV news anchor.