Nikki Castillo

The team's job to locate some sunken treasure goes wrong when Paige and Walter's boat explodes, leaving them stranded in the Pacific Ocean with sharks.

The team are exposed to toxic vapour after trying to decommission an old nuclear missile. Meanwhile, Paige confronts Happy about her third wheeling.

The team meets their new, disgruntled neighbour; a device that could avoid nuclear meltdown gets misplaced in the LA sewerage system; Walter discovers a new way to communicate with Paige.

Walter chooses work over spending time with his friends on Christmas Eve, before a fall down the stairs results in an injury that sees him enter a dream world where Team Scorpion never existed.

The team head to the bayou to track down an alligator and stop a fatal virus; Paige teaches Walter about white lies, and Toby must find a way to save Cabe's life.

The team postpone their Valentine's Day plans to assist a pilot and a doctor trapped inside a helicopter. Toby and Happy anxiously wait for their fertility results. Sylvester discovers he may have feelings for Florence.