Thanks to EW we now have a plot line of the first Fantastic Beasts movie:
Eccentric magizoologist Newt Scamander (Oscar winner Eddie Redmayne) comes to New York (for a reason we won’t disclose) with his trusty weathered case. This case is one of those way-way-way-bigger-on-the-inside magical devices, and within are expansive habitats for a collection of rare and endangered magical creatures from Newt’s travels around globe. He discovers the American wizarding community is fearfully hiding from Muggles (who are called “No-Maj” in the States) and the threat of public exposure is an even graver concern than in the UK (remember the Salem witch trials?). Fantastic Beasts is the story of what happens when this uniquely skilled English wizard travels to wiz-phobic America and a variety of his creatures, some quite dangerous … get out of their case.
It looks like we were right about the briefcase containing magical creatures that escape!
So, what can we take from this? Newt has performed an undetectable extension charm (Capacious Extremis) on his briefcase to house the many foreign magical creatures he wishes to study. While briefly stopping in American nearing the end of his world-wide trip, these dangerous magical creatures are somehow let out of their case in the time of the magic-fearing public looking to ignite a second batch of Salem witch trials. Newt, with the help of friends, must gather all these creatures before he, and they, become exposed to the public.
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