"...In 'The Beast', an unorthodox but effective FBI veteran (Patrick Swayze) trains a new partner (Travis Fimmel) in his hard-edged and psychologically clever style of agenting while himself being pursued by a secret Internal Affairs team.
The mischievous veteran hazes his new partner as they work undercover, brilliantly manipulating situations, constantly testing his new partner and pushing him to delve deeper into his 'roles'.
As he realizes he can no longer maintain normal relationships and still do his job, the rookie is confronted with yet another challenge: An FBI team trying to enlist him as a double-agent in the bureau's investigation of his partner..." 
