Grumpy was a large mad dinosaur which was nicknamed Grumpy by the Marshals.
Grumpy has a familiar face in the TV series the Land of the Lost and appeared in nearly every episode, albiet briefly. He along with the Sleestaks were the most iconic image for the series. Grumpy was a menace that stalked the Marshals and co, always wanting to eat them all ways failing. Grumpy fought with all sorts all types of creatures including Big Alice the Guardian Of The Lost City.