Fifteenth broken moon of the Medusa Cascade

Fifteenth broken moon of the Medusa Cascade
Type:	Moon
Location:	Medusa Cascade
Natives:	Unknown
Appearances:	DW: The Sontaran Stratagem (mentioned)

The Fifteenth Broken Moon of the Medusa Cascade was a moon found within the Medusa Cascade. The Doctor wanted to take Donna Noble there. (DW: The Sontaran Stratagem)

The titles implies there are at least 15 moons in the Cascade.