Sentinel Prime

Sentinel Prime is a major character in the Transformers franchise. He is normally depicted as a hero and protagonist of the series who mentored Optimus Prime and was the leader of the Autobots before his successor and protégé. However but on occasion has been depicted as a villain in several adaptations. One of the series to depict Sentinel Prime in a negative light was the iteration from the Transformers Cinematic Universe, where he served as the main antagonist of the third installment, Transformers: Dark Of The Moon.