Doctor Who: 10 Villains Who Should Return For Russell T Davies' New Series
5. The Flood
We often forget how fantastic The Waters of Mars truly is. It gets lost in the shuffle of a mediocre run of specials, but it deserves to be mentioned alongside the very best that Doctor Who has to offer.
Terrifying in its simplicity, the Flood is a viral species that can spread its nasty influence through a single drop of water, giving its victims cracked skin around their mouths, and causing them to emit infected water. Even with the Tenth Doctor's help, the crew aboard Mars's Bowie Base One stood no chance, so just imagine the sort of horror the Flood could unleash if it somehow found its way to Earth.
We'd love to see RTD do a Doctor Who zombie movie where the Flood infects a water park, transforming hundreds of visitors into its puppets. The only concern here is that overexposure could diminish the Flood's scare factor, but with RTD showing restraint in providing concrete answers about the Midnight entity, he seems to understand that the true horror lies in the unknown.
The last thing we need is a Flood backstory.