Colin Ferrell was excited to participate in the Harry Potter story, Fantastic Beasts and Where to Find Them. It's a spin-off prequel, produced and written by J.K Rowling.
Ferrell plays Percival Graves, director of security for MACUSA (Magical Congress of the United States of America). His job is to protect wizards and to track down Eddie Redmayne's character, Newt Scamander.
Watch the video in the player above for Ferrell's experiences in Fantastic Beasts!