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After dinner, the live performance was interrupted by two characters who staged a coup, killing Rocky, Frank and Columbia in the process. How did these characters leave the scene of the movie?
Answer: flew away in the castle
The performance was interrupted by Riff Raff and Magenta, who announced their plan to return to the planet of Transsexual, in the galaxy of Transylvania. In the process they killed Columbia, Rocky and Frank. They released the humans (Brad, Janet, and Dr. Scott) and then departed by lifting off in the actual castle, which flew off under a rainbow.