Mission: Impossible - Season 1 Episode 18

The American submarine USS Concorde is dramatically lost at sea and the few surviving crew members report that the submarine was blown apart by a torpedo containing a sophisticated computer virus. This virus killed the submarine's computer system, leading to the underwater ship being impossible to control. Jim Phelps and his team of agents get the mission to find the virus program which sunk the Concorde, so that an antidote program can be created. They have to find the virus's creators, and put them out of the virus creating business for good.