Daffy and Speedy had been paired together in a series of cartoons from 1965 to 1968. This was their final theatrical pairing, and this was also the final theatrical short to star "classic" Warner Bros. characters as well as the last Golden Age of American Animation cartoon to feature Daffy or Speedy. After this short, until the cartoon division closed in 1969, new characters like Cool Cat, Bunny and Claude, Merlin the Magic Mouse, and a few one-shot cartoons made up all of WB's output.
Plot
The plot concerns Daffy and Speedy accidentally being sent back in time via a time machine to Rome, 65 A.D. There, they offend a centurion who sends them to the lions as entertainment for Emperor Nero in a gladiator arena. Daffy and Speedy work together to thwart a lion. They soon break Nero's fiddle and the enraged emperor chases the two.
Back in the present timeline, the scientist discovers Daffy and Speedy being chased by a furious Nero. He manages to bring the two back to the present. However, Nero has accidentally returned with them and is horrified by this. Speedy helps him adjust until the scientist can bring him home. Daffy is about to go to bed when he hears music playing from outside from his room. Much to his dismay, it is Speedy's band playing again. Adding to his annoyance is that Nero has joined the band by playing his fiddle.
^Beck, Jerry; Friedwald, Will (1989). Looney Tunes and Merrie Melodies: A Complete Illustrated Guide to the Warner Bros. Cartoons. Henry Holt and Co. p. 365. ISBN0-8050-0894-2.