Billy Dilley is the titular character from the animated television series "Billy Dilley's Super-Duper Subterranean Summer," which aired in 2017. The show follows the adventures of Billy Dilley, a quirky and eccentric middle school science teacher, and his students, Zeke and Marsha. When their school bus accidentally ends up in a subterranean world, they embark on a series of bizarre and fantastical adventures in the strange underground realm. The show combines humor, science fiction, and creativity, making it an entertaining and imaginative series for viewers of all ages.