Los Angeles: If you associate Daniel Radcliffe only with the lovable wizard Harry Potter, the trailer of "Imperium", which stars as the British actor as an undercover FBI agent who infiltrates a group of neo-Nazis, will leave you stunned. In the film, Radcliffe stars a young and idealistic FBI agent named Nate Foster who infiltrates a white supremacist group in order to foil a radical right-wing terrorist group's attempt to make a dirty bomb. In the trailer, Foster is recruited by a senior agent named Angela Zampino (Toni Collette) and asked to go undercover as a neo-Nazi group's follower, reports aceshowbiz.com. "I need an informant. Get in there and make a difference," she says. "I don't have the skills for this," Foster replies, adding, "I can't even defend myself!" Foster is heard saying in a voiceover, "Big things are coming," indicating the terrorists group already makes their move. Several scenes show Foster willing to shave his head, get a tattoo on his body and spend all his time with the white supremacist group. He must confront the challenge of sticking to a new identity while maintaining his real principles as he navigates the dangerous underworld of white supremacy. Inspired by a true story of Michael German, a former agent who spent years inside the neo-Nazi movement, the film is directed by Daniel Ragussis. He and German co-wrote the script. "Imperium" also stars Tracy Letts, Nestor Carbonell, Burn Gorman, Set Numrich and Sam Trammell. The film will release in US theaters on August 19.