DeCaster was the leader of the Schirr who were frozen in mortal death on an Unidentified Asteroid. He devised a plan where he could use Human bodies as templates in order for them to regenerate their bodies with new and healthy ones. He almost succeeded, however, the Doctor with the work of his companions stopped the asteroid from travelling to the Morphiean Quadrant. This stopped the transformation and thus killed the Schirr. (Ten Little Aliens)

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