DS9 Season 7 Episode 7 Once More Unto the Breach

Plot

The famous warrior Kor, aging and increasingly senile, has lost influence in the Klingon Empire. He comes to DS9 to ask his friend Worf, the only Klingon in Starfleet, for help in securing a starship command and a chance to die in battle. Worf brings the request to General Martok, who angrily rejects it: Kor once rejected Martok's application to become an officer based on Martok's lower-class lineage, and the general still holds a grudge. As a compromise, Worf appoints Kor as the third officer of the Ch'tang, Martok's ship, for a raid into Dominion space.
Once aboard, Kor recounts old war stories to a crew enthused with having a living legend among them. However, this changes after the first battle. when Martok and Worf are temporarily incapacitated and Kor is forced to take command. Kor's senility causes him to relive an old battle and give inappropriate commands. Disaster is averted when Martok and Worf recover and resume command.
Kor's pride is severely hurt as Martok and much of the crew mock him. Worf is forced to remove Kor from duty, but blames himself for placing him in an untenable situation. Martok also realizes mocking Kor has brought him no pleasure. The pair agree to appeal to Chancellor Gowron to find a worthy and suitable place for Kor.
As the Klingons return to friendly space, they discover ten Dominion ships are in pursuit and will intercept them before they reach safety. Worf prepares to embark on a suicide mission in one vessel to delay the pursuers, and allow the remaining Klingon ships to escape. Kor learns of Worf's plan from Martok's aide Darok, an old Klingon who is Kor's age and is sympathetic to his plight. Kor's pride is rekindled when he realizes only his lifetime of experience can make the plan work. It is also the warrior's death he has longed for. Kor sedates Worf and takes his place on the mission, assuring Worf that when he reaches the halls of the honored dead, he will find Worf's late wife Jadzia Dax and tell her that Worf still loves her.
Martok and his crew observe the battle from the Ch'tang. Against the odds, Kor succeeds in delaying the enemy. Martok is the first to toast Kor's bravery, and the crew sing to Kor's victory.