Crespallion (species)

Crespallions are a blue-skinned race charged with running Platform One in DW: The End of the World. Some Crespallions were of average humanoid height, others no taller than humanoid children. Notable Crespallions include Steward and Raffalo, both workers on Platform One.

(Description taken from Doctor Who: The Encyclopedia A Definitive Guide to Time and Space by Gary Russell)