Prior to his discovery and death, an American intelligence officer working undercover at a Soviet Naval base sends proof of the Russians filming American submarines off a joint US-Spanish naval base in San Juan, on the coast of Spain. American intelligence "Super Agent" Jeff Larson (Ray Danton) is sent to San Juan to investigate where he meets up with his former colleague Bob Stuart (Roger Hanin), and his Spanish contact, Pilar Perez (Pascale Petit). Larson (code name "
Jaguar"), helps the American military discover remote controlled video cameras being used by the Soviets. These cameras are
boobytrapped using sophisticated
landmines, killing two Spanish sailors who tried to disarm one. Larson
skin dives to clandestinely board a Soviet
spy ship to discover that not only are they monitoring American submarines, but they are intercepting radio transmissions from the US-Spanish naval base as well as having a
mole on the base. Larson successfully disarms a landmine protecting another video camera, saves the camera for analysis and hatches a plan to convert the landmine into a
limpet mine and "return [it] to sender." Throughout the escapade Larson survives several assassination attempts. == Cast ==