Medusa Cascade

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 * 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.