Percy Jackson & the Olympians season 1, episode 7 sees Percy and his friends finally reaching the Underworld, but he and Grover nearly get pulled into Tartarus, a pit with origins in Greek mythology.

Jackson leans on his friends Grover (Aryan ... Grover, wearing the enchanted flying shoes, is suddenly pulled toward the pit of Tartarus. Percy saves Grover, and afterward, he discovers Zeus ...