Medusa Cascade

{{Infobox Astronomical Object |imag[DW]]: The Stolen Earth/Journey's End (seen)
DW: Last of the Time Lords
DW: The Fires of Pompeii
DW: The Sontaran Strategem
DW: Midnight (me

The Doctor told Donna Noble that, amongst other places, he wanted to take her to visit the Fifteenth Broken Moon of the Medusa Cascade. (DW: The Sontaran Stratagem)

The Doctor used the words "Medusa Cascade" to see if the possessed Sky Silvestry would repeat him. (DW: Midnight)

The Medusa Cascade was also the place where Davros's New Dalek Empire moved 27 planets to form a sort of interplanetary device. The planets could not be normally found as they were out of sync from the rest of the universe by about a second. (DW: The Stolen Earth). He placed them there so that when his Reality Bomb was set off it could penetrate the space-time rift in the Cascade and spread the bomb's destructive force across every universe and all of existence.

This led to the War in the Medusa Cascade. It ended with the destruction of the Daleks by the Doctor, his clone and all of his companions and also the return of all of the planets to their correct locations in space. The Cascade was also used to send Jackie Tyler, Rose Tyler and the Doctor's clone to Pete's World.