NEW YORK — J.K. Rowling’s “Fantastic Beasts and Where to Find Them” isn’t going to be a trilogy, it’s going to be a pentalogy.

At a fan event for the upcoming film in London on Thursday, the author revealed that the budding franchise will now stretch to five films. The first, starring Eddie Redmayne, opens Nov. 18.

The announcement, which Warner Bros. confirmed, immediately fueled conjecture that the “Harry Potter” prequel, set decades before Potter’s birth, could lead right up to the young wizard.

The second “Fantastic Beasts” is in pre-production, and due in theaters in November 2018.