15-th episode of 4-th season "Doctor Who"

What "Doctor Who" 15-th episode about

The Doctor joins forces with his oldest companion on record when a military base comes under attack from sentient, dangerous waters. It may be another stand against immeasurable odds, but waiting in the wings for the Time Lord is a sign all songs must end....

Episode number: 15

Episode name: "The Waters of Mars"

Episode release date: 15 november 2009 at 19:00

Status: aired