Optimus Prime is the leader of the Autobots in the Transformers franchise, which began in 1984 with a toy line and animated series. Voiced most famously by Peter Cullen, the character became known for calm, principled speeches and a deep sense of duty. Clips of his voice have circulated online for years as reaction audio, especially in meme edits that contrast his serious delivery with everyday situations. That contrast keeps the sound popular across gaming, film and short-form video communities.