|Relatives||Giant Monster, Massive Monster|
|Introduced In||Finn's Missing|
Big Monster is a character who was first seen in Finn's Missing. He was one of the monster where Jake, Lady Rainicorn and BMO came across and fought. He is the smallest one of his brothers.
Big Monster is a big red monster, he has a oval head with an octopuss mouth, a tail and four long legs.
Big Monster has immense strenght and can spit fire out of his mouth.