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As Harris' experiment at the science fair goes haywire with potentially explosive consequences, the school's MECH-X4 fan club threatens to reveal Ryan's secret identity.
The team follows clues to Leo, the creator of MECH-X4, to his last known location and find themselves under attack from a prototype version of MECH-X4.
On the robot's first ever deep sea mission, Ryan and the team discover the terrifying truth behind the monsters.