Series: Doctor Who
Season 4 Special
Previous: “Planet of the Dead”
Next: “The End of Time: Part One”
Adelaide and the Doctor flee from the water creature down the connecting tunnel.
Source: The Doctor Who Locations Guide
The Doctor arrives on Mars and it captured and brought into the Mars base.
The Doctor returns to Earth with the surviving Mars crew and is met by Ood Sigma.
The water creature starts its invasion of the Mars base by killing several people.