Phoenix, Arizona, where she became interested in the profession. Happy has a hostile exterior, which is somewhat ironic considering her name is happy and generally she is not happy. The trauma in the foster system caused her mistrust of people. She possibly has PTSD from her trauma, and her symptoms include flashbacks, aggression, and avoidance of certain memories. She normally keeps her emotions in check, but gets angry quickly and tries to deal with her pain by turning it into rage. Despite being closed off, she truly does love her friends. Toby and she start dating and are later married. Ari Stidham as Sylvester "Sly" Dodd, is a gifted mathematician and statistician with an IQ of 175; he is described as a "human calculator". He is a highly sensitive person and struggles with obsessive–compulsive disorder and anxiety, and harbors fears of germs, air transportation, and boats and open water. He has more phobias than can be counted (including claustrophobia and ornithophobia) and an eidetic memory. Sly's phobias can be limiting, but he is a courageous man who fights through those fears during times of distress. His parents were frustrated with him, as he was a disappointment to them and sent him to live with his uncle before Christmas one year. However, at the age of 16, he hacked a bank and stole $2,500, and ran away. Eventually, he ended up alone, broke, and scared, "contemplating bad things", until the bank's forensic analyst tracked him down. Walter never reported him to the bank. Once, his father gave him weights as a gift, as his father wanted him to be into sports. He was married to Walter's sister Megan before she passed away. Robert Patrick as Agent Cabe Gallo, is a former Marine and was an FBI agent before joining Homeland Security; Gallo initially recruits the team to fix a serious air traffic control problem; afterwards, he asked them to become a liaison team to tackle difficult missions that the government does not have the human resources or technological prowess to handle. When he was younger, he was married to a woman named Rebecca, with whom he had a daughter, Amanda, who died of a terminal illness at a young age with him by her side. He divorced Rebecca, but he only asked for their house. He first met 11-year-old Walter when he was the agent who was sent to investigate the