10 Doctor Who Deleted Scenes You Need To See
6. A Message From The Flood
After leaving Rose behind and wiping Donna's memories, the Tenth Doctor's solo travels took him to Mars, where he wound up in the middle of a struggle between human astronauts and a mysterious waterborne parasite.
If a single drop of the stuff gets on you, then you're done for. Cue a very tense hour as the Doctor and his chums try to evade a horrible, soggy fate.
Once the Flood inhabits a human, the skin around their mouth dries up and cracks. Water constantly flows from their mouth too, which makes it rather hard for them to speak.
However, in one particular deleted scene, you can actually hear them talk (8:50 in the video below).
The Flood were originally going to have this scene – possibly multiple scenes – with dialogue, but this element was completely stripped out during editing. Russell T Davies believed that they were more menacing without a voice, and you know what, he was right. This scene also explains how the Doctor magically knows the Flood's name later in the episode, but that's hardly the most important reason to keep it in.
It's fascinating to see this slightly different approach to The Flood, but if they'd spoken throughout the entire episode? It would've diluted their effectiveness significantly.