In just a few months, the magical world of Harry Potter will return to theaters around the world in Fantastic Beasts and Where to Find Them. Today, Warner Bros. has unleashed the fourth and final trailer, along with a brand new poster. We also have a very special video featuring the cast of this J.K. Rowling prequel that imagines a world before Harry and his friends ever stepped foot in Hogwarts.

The full-length Fantastic Beasts trailer shows off plenty of new magic spells and scary monsters, unleashed in an unsuspecting New York. There is also an announcement greeting from the cast for Warner Bros. upcoming free Global Fan Event, Fantastic Beasts: A Return to J.K. Rowling's Wizarding World. It is taking place on October 13th.

In select IMAX and non-IMAX theaters around the world, fans are invited to join the cast from Fantastic Beasts for a live Q&A. They will be the first to see exciting new footage from the upcoming film. For those unable to attend at a participating theater, the event will be live streamed on Fantastic Beasts Official Facebook Page. The movie is an all-new adventure returning us to the wizarding world created by J.K. Rowling.

Academy Award winner Eddie Redmayne (The Theory of Everything) stars in the central role of wizarding world magizoologist Newt Scamander, under the direction of David Yates, who helmed the last four Harry Potter blockbusters. Fantastic Beasts and Where to Find Them opens in 1926 as Newt Scamander has just completed a global excursion to find and document an extraordinary array of magical creatures.

Arriving in New York for a brief stopover, he might have come and gone without incident...were it not for a No-Maj (American for Muggle) named Jacob, a misplaced magical case, and the escape of some of Newt's fantastic beasts, which could spell trouble for both the wizarding and No-Maj worlds.

Fantastic Beasts and Where to Find Them also stars Katherine Waterston (Steve Jobs, Inherent Vice) as Tina; Tony Award winner Dan Fogler (The 25th Annual Putnam County Spelling Bee) as Jacob; Alison Sudol (Dig, Transparent) as Tina's sister, Queenie; Ezra Miller (Trainwreck) as Credence; two-time Oscar nominee Samantha Morton (In America, Sweet and Lowdown) as Mary Lou; Oscar winner Jon Voight (Coming Home, TV's Ray Donovan) as Henry Shaw, Sr.; Ron Perlman (the Hellboy films) as Gnarlak; Carmen Ejogo (Selma) as Seraphina; Jenn Murray (Brooklyn) as Chastity; young newcomer Faith Wood-Blagrove as Modesty; and Colin Farrell (True Detective) as Percival Graves.

The film marks the screenwriting debut of J.K. Rowling, whose beloved Harry Potter books were adapted into the top-grossing film franchise of all time.  Her script was inspired by the Hogwarts textbook Fantastic Beasts and Where to Find Them, written by her character Newt Scamander. Take a look at the all-new action packed trailer courtesy of Warner Bros. along with the cast announcement and new poster.