Set in 1977, “Late Night with the Devil” follows Jack Delroy, a late-night talk show host who struggles to compete with the reigning king, Johnny Carson. After a hiatus following his wife’s death, Jack and his producer Leo decide to host a Halloween special with a supernatural theme, hoping to boost ratings. However, things take a sinister turn when guests begin to experience bizarre and gruesome phenomena, including vomiting black goo and having worms crawl out of their bodies. As the night progresses, it becomes clear that more than just ratings are at stake, and Jack and his team must face the darkest forces of the unknown.