In the season finale, the team, although torn apart and uncertain as to their future, must come together to save Walter's life as his car hangs off the side of a cliff.
Walter learns Cabe's long-hidden secret regarding the Baghdad mission and it threatens to tear Team Scorpion apart. Meanwhile, Ralph puts his life in danger to help the team.
Team Scorpion's helicopter crashes while on a mission to save lost hikers. The crash ignites a massive wildfire that quickly closes in on them. Meanwhile, Sylvester tries to help the injured pilot who is unable to make it to safer ground.moreless
Team Scorpion is asked to assist secret peace talks when a conflict in Eastern Europe heightens and threatens a World War III scenario.
The team investigates a murder, where the victim is using an alias from Gibbs past. Bishop get's anxious over the thought of having to work under cover in the future, and the team learns the secret of Gibbs working as a computer nerd.moreless
A tech billionaire hires Team Scorpion to rescue his kidnapped daughter. Meanwhile, some feelings get hurt when Walter gives an interview and fails to acknowledge the other members of the team.
Team Scorpion work undercover on a cruise ship to locate and disable stolen rockets. Meanwhile, Toby and Happy help Ralph deal with his first crush, as Valentine's Day approaches.
A 10-year-old girl Sam once provided protection detail for in Saudi Arabia goes missing, and he's convinced her disappearance is directly connected to the theft of software for a new unmanned-aerial vehicle being developed by her engineer father.moreless
When a prison inmate is murdered, a serial killer claims to have information useful to the case. Frankie readies himself for the detective exam.
After a young dockworker is killed, evidence surfaces that the mob has connections to dock operations, which brings up questions regarding involvement by Maura's biological father. Jane does everything she can to get out of sensitivity training. Meanwhile, Maura and Tommy start spending time together.moreless
When a serial killer strikes in Los Angeles, it grabs the attention of Abby Sciuto. She travels from Washington DC to give the team a hand, since she has been following this killer for some time.moreless