Skak

Skak was a grey, spindly stone-like alien.

He was a war criminal. The bounty hunter Deathy tried to catch him in Russia. His friend Ephnol was caught by Deathy and locked in time.

Ephnol contacted Skak to help him. Skak tried to set Skak free, which caused the house of the O'Brians and a Victorian house to swap places in time. Deathy caught Ephnol together with Sarah Jane Smith and her team and put the houses into the right time again. Deathy took Skak and Ephnol with him to bring them to trial. (AUDIO: The Ghost House)