Gumby and friends have been ordered to perform for King Ott on pain of death. Professor Kapp is also invited. On the way to Ott's castle, everyone is stopped by the Black Knight, who plans to hold them ransom, as knights in black armor tend to do. For some reason, he agrees to release them if Gumby can beat him in a duel, just like any thick-headed villain would if he had his enemies right where he wanted them. Fortunately, Professor Kapp remembered to bring the deus ex machina, his Shrink-A-Dink. They shrink the knight small enough so as to be defenseless and continue to Ott's castle. The knight is forced to swear fealty to Ott if he wants to unshrink him.