Kosmic, formerly Kosmicd12, is an American video game streamer, YouTuber and speedrunner. He was the first person to beat Super Mario Bros. in 4 minutes, 55 seconds, a time that was previously called impossible. Kosmic is considered one of the world's top Super Mario Bros. speedrunners. He is also known for his technical knowledge of Super Mario Bros. and other games, having helped discover various glitches and exploits.