Disney+ has released a teaser trailer for its upcoming series, “Percy Jackson and the Olympians,” featuring Walker Scobell as Percy, Leah Sava Jeffries as Annabeth, and Aryan Simhadri as Grover. The show follows Percy, a 12-year-old demigod, on a quest to retrieve Zeus’s stolen lightning bolt. Based on Rick Riordan’s novels, the series premieres on Dec. 20 and promises an exciting adventure in the modern-day world of mythical beings.