'Tis the season for the ultimate box-office battle! "Mary Poppins Returns," vs. "Aquaman" and "Bumblebee." Entertainment Tonight takes you inside the must-see movies of the holiday season. Plus, new interviews with "Mary Poppins Returns" stars Emily Blunt and Lin-Manuel Miranda. And, wait until you hear "Holmes and Watson" stars, Will Ferrell and John C. Reilly interview each other.

Then, "Working Girl" turns 30! Our epic 1988 flashback, from the set, with star Melanie Griffith. Entertainment Begins and ends with ET.