About this "The Simpsons" episode:
The Simpsons - Simpson Tide is the 19th episode of season 9 and number 197 overall in the series.

Homer is fired from the Nuclear Power Plant following a near meltdown, and decides to join the Naval Reserve. Meanwhile, Bart decides to get an earring. Homer graduates from basic training, and must go of on a mission of war games, but not before taking Bart's earring, which he disapproves of. Later, on the submarine, Homer befriends the Captain, who leaves him in charge when he goes to check a blocked torpedo. Homer believes the ship is being fired at, and launches a torpedo, accidentally ejecting the Captain. Homer eventually gets the submarine lost, and is considered a traitor by the media. The United States Navy fires at the submarine, causing a leak which Homer stops with Bart's earring. The submarine is soon surfaced, and Homer is taken into custody by the Navy. However, he escapes any trouble due to the Navy judges having to resign over various scandals that they are involved in. Homer then leaves the Navy with a dishonorable discharge.