Sentinel Prime (Japanese: センチネルプライム) is a fictional character in the Transformers franchise. Generally depicted as an Autobot leader, Sentinel Prime has served as either a supporting character or antagonist in Transformers media, and sometimes a dirtbag. His first screen appearance was in the original Transformers cartoon in 1986 as a brief character in one episode. But his first major role was in Transformers Animated (2007-2009) where he blamed the supposed death of Elita-One on Optimus and took the role of Prime for himself. His character in the series is depicted to be racist towards humans, hates Optimus, overconfident, thinks he's the best (although he isn't), and bosses everyone around like as if they are complete nothings. His first film appearance was in the 2011 film Transformers: Dark of the Moon as the main antagonist, and he eventually returns as the main antagonist in the 2024 animated film Transformers One.