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The Ravenous were a race of creatures from the "old times."
After defeating the Kandyman's and the Eleven's scheme with the thought spider, the Eighth Doctor and his companions caught of a glimpse of faces reflected in glass, screaming, and Helen Sinclair saw a word in her mind: "Ravenous." Afterwords, the Eleven mused to himself that he knew what they fed on, and that all anybody could do was run. (AUDIO: Sweet Salvation)
The Eleven was later found by one of the Ravenous onboard a dying TARDIS which he had stolen. The Eleven was scared enough to call for the Doctor’s help escaping it. (AUDIO: Seizure)