Planet of Dinosaurs follows the adventures of some funny dressed and obnoxious space travelers after their spaceship ends in an unknown planet unhabited by aliens wich happens to look like dinosaurs.
There is an alien tyrannosaurus living in a cave in the hills wich is determined to kill every form of life in said planet, now including the bunch of humans.

https://www.youtube.com/watch?v=S2DqiQtWuDA