Overview
- The special, which premieres Sunday, April 5, streams on HBO Max at 3 p.m. ET and airs on HBO at 8 p.m. ET.
- A new trailer shows detailed set builds like Diagon Alley and the Great Hall along with costume tests and creature effects.
- Interviews feature John Lithgow as Dumbledore, Janet McTeer as McGonagall, and Paapa Essiedu as Snape, with narration by Nick Frost as Hagrid.
- Season one, officially titled Harry Potter and the Philosopher’s Stone, is still filming at Warner Bros. Studios Leavesden in the U.K. for a Christmas 2026 launch.
- HBO presents the documentary as a fan engagement move for a long‑term series plan and highlights the casting process for Dominic McLaughlin, Arabella Stanton, and Alastair Stout as the new trio.