In the realm of King Arthur, trouble ensues when the Singing Sword is stolen by the infamous Black Knight Yosemite Sam. King Arthur, along with his loyal Knights of the Round Table, seeks a volunteer to recover the stolen artifact. Reluctantly, court jester Bugs Bunny is assigned the mission by King Arthur, facing considerable consequences if he fails.
Upon infiltrating the castle of the Black Knight, Bugs encounters a dragon, companion to Yosemite Sam, suffering from a cold-induced sneezing fit. Taking advantage of the situation, Bugs retrieves the Singing Sword from the castle's chest as the Sword starts humming "Cuddle up a Little Closer, Lovey Mine" until Sam wakes up from his nap. As Bugs escapes, Yosemite Sam gives chase on the dragon, leading to a series of comical encounters. Bugs outsmarts Yosemite Sam by utilizing the castle's defenses against him, causing various mishaps including Sam falling into the moat and being flattened by a failed catapult launch. Despite Sam's persistent pursuit, Bugs ultimately traps him and the dragon in an explosives stockade within the castle.
As Bugs departs with the Singing Sword, the dragon's sneeze triggers an explosion that propels Sam and the dragon towards the moon. Bugs bids them farewell as the Singing Sword plays "Aloha 'Oe" at the end.
In the Tiny Toon Adventures episode "Who Bopped Bugs Bunny?", the Oscar win of Knighty Knight Bugs is a major plot point. Mirroring the real-life loss of the Terrytoons short at the Academy Awards, a character named Sappy "Slaphappy" Stanley (a parody of "Silly" Sidney, here voiced by Jonathan Winters) was defeated for the Shloscar Award. As a result, Stanley scorned the U.S. film industry and relocated to France, where despite becoming a national star still nursed a bitter grudge against Bugs, culminating in the episode's plot.
References
The phrase "Sir Loin of Beef" was used in Bugs Bunny parody Rabbit Hood by Bugs to con the gullible Sheriff of Nottingham.
The phrase "Sir Osis of the Liver" was used in the Bugs Bunny parody Knight-mare Hare.
The gag on a dopey fire breathing dragon was also used in Knight-mare Hare and on the cartoon series Here Comes the Grump.
^Beck, Jerry; Friedwald, Will (1989). Looney Tunes and Merrie Melodies: A Complete Illustrated Guide to the Warner Bros. Cartoons. Henry Holt and Co. p. 309. ISBN0-8050-0894-2.