Based loosely on the novel with a similar name, Dr. Jekyll and Mr. Hyde follows Dr. Jekyll as he walks to his wedding. For some reason though, everyone and everything is out to kill him, and if he gets attacked too many times, he will involuntarily transform into the monster Mr. Hyde. Once he becomes Hyde, he enters a mirror world where he must kill a number of demons to return to the real world and his normal self. Jekyll must advance further than his doppelgänger in each level in order to successfully reach his wedding.

By taking almost no damage in this TAS, the demon world is never seen. This is practically impossible to do without tool assistance, and even causes the game to exhibit glitches that speed up the game.