The Time Witch was a four part story from Doctor Who Weekly #35-38, written by Steve Moore and drawn by Dave Gibbons.
The plot[]
The Doctor and his companions K9 and Sharon Davies encounter an alien woman named Brimo who has been imprisoned by her own race for misusing her great powers for her own gain. The Doctor successfully re-imprisons Brimo in her 'Eternity Capsule', but not before Sharon is unexpectedly aged four years, from a schoolgirl into a young woman.