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.
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 try to protect Cabe's ex-wife, after she uncovers evidence that suggests foul play in the death of a prominent congressman.
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