'Percy Jackson and the Olympians' Cast Shares How New Series Expands on Beloved Books (Exclusive)

Walker Scobell, Leah Sava Jeffries and Aryan Simhadri chat with ET's Ash Crossan about 'Percy Jackson and the Olympians.' The cast explains how their live-action adaptation is not only faithful to the best-selling books, but also tease how the TV series will add new elements to author Rick Jordan's literary universe. 'Percy Jackson and the Olympians' debuts Dec. 20 on Disney+ with a two-episode premiere, followed by new episodes weekly.