"Goodbyeee", or "Plan F: Goodbyeee", is the sixth and final episode of Blackadder Goes Forth, the fourth and final series of British historical sitcom Blackadder. The episode was first broadcast on BBC1 in the United Kingdom on 2 November 1989, shortly before Armistice Day. Apart from the one-off short film Blackadder: Back & Forth made a decade later, it was the last episode of Blackadder to be produced and transmitted.

Blackadder Goes Forth is the fourth series of the BBC sitcom Blackadder, written by Richard Curtis and Ben Elton, which aired from 28 September to 2 November 1989 on BBC1. The series placed the recurring characters of Blackadder, Baldrick, and George in a trench in Flanders during World War I, and followed their various doomed attempts to escape from the trenches to avoid death under the misguided command of General Melchett. The series references famous people of the time and criticises the British Army's leadership during the campaign, culminating in the ending of its final episode, in which the soldiers are ordered to carry out a lethal charge of enemy lines.