You and your kind are parasites. You're dependent upon us for the air you breathe and the food you eat. We have only one use for you!
Who: Harrison Chase
Source: Doctor Who The Seeds of Doom episode 6
Note: As Sarah is searching for Henderson in the basement, Chase tells her that Henderson has been put in his compost machine and then decides to put her in there as well. Later, the Doctor shows up and releases Sarah, only to get into a struggle with Chase. In the end, the Doctor tries to save Chase from being crushed, but Chase tries to pull him in, but fails and dies.