Mike Warren graduated first from Quantico and is expected to be posted in Washington. However he was assigned to South California in  a house called Graceland. Later it was revealed that he is tasked to investigate one of their own and an FBI legend Paul Briggs. 

At first he had a hard time adapting to his new situation especially separating the cover with his real identity. Aside from keeping  his cover outside the house he still has to lie to his housemate in order to investigate Briggs. 

There are signs that Mike is compulsive. He put himself in danger several times because of he is impatient. He is indebted to Briggs for saving his life. Although he asked his supervisor Juan Badillo to stop the investigation of Briggs he does not completely trust him. He is smart but most of the time is outwitted by Briggs. 

Mike Warren is played by Aaron Tveit. He played Enjolras in the 2010 film adaptation of Les Miserable. He also had different guesting with shows like Gossip Girl, Ugly Betty and Body of Proof