Baldrick plan" made its first appearance in the pilot episode, but it is not regularly used until the third series; Blackadder had mentioned the phrase twice in the first series and Baldrick once. Baldrick had also claimed to have "a plan" in a "cunning" voice on one occasion in "Blackadder II". In the final episode of the last series, "Blackadder Goes Forth", Baldrick announces that he has a cunning plan to save the main characters from "going over the top", although it is never revealed what this plan might be (other than that it is "as cunning as a fox who's
Blackadder: The Cavalier Years danger, immediately rises from his seat, ready to take action. But it is too late; Roundheads are already at the Hall's doors demanding his surrender. Sir Edmund explains to Baldrick that there is no choice for a man of honour but to stand and fight, and die in defence of his future sovereign. However, as a Blackadder, he was never a man of honour. Passing the prince to Baldrick, he proceeds to remove his long black hair (which was apparently a wig), his false moustache and beard, to reveal a Roundhead appearance – short blond hair and a clean-shaven face.