Sceadu
From Tardis Wiki, the free Doctor Who reference
The Sceadu were an aggressive race of beings made of anti-photons which could only exist in the dark. Having all but destroyed the Prin, they hunted down the last Prin to the planet Earth where he was hiding, disguised as a human who lived in a house that was lit all year supposedly to celebrate Christmas. Trapped in the Prin ship prior to take-off, the ship blasted off and the Prin was taken to a safe place to live by the Eleventh Doctor (DWAN: The House of Lights)
