This one-hour ET special gives fans a behind-the-scenes look at the franchise's 1,000th episode and includes exclusive interviews with the stars of NCIS, NCIS: LOS ANGELES, NCIS: NEW ORLEANS, NCIS: HAWAI'I and NCIS: SYDNEY. The cast and guest stars share favorite memories and behind-the-scenes moments from 20 years' worth of never-before-seen interviews from the ET vault.

Jimmy shares his favorite inspirational quotes to help everyone kick off their week with good vibes before speaking with guests Jim Parsons and Kaia Gerber and welcoming Heart for a musical performance.

Country powerhouse Keith Urban is enlisted as Mega Mentor to help prepare the artists for the Knockouts. The coaches pair two artists to perform solo against each other, then select a winner to move on to the Playoffs. Each coach has one steal.