Carnotaurus

Carnotaurus (meat-eating bull) is an extinct genus of abelisaurid theropod dinosaur that lived in Argentina during the Late Cretaceous period.

Journey of the Brave
Carnotaurus appeared when Cera, Petrie, Ducky, and Spike searching for Littlefoot after finding his footprints and then Carnotaurus starts chasing them and trapping them inside a cave.