Last of the Time Lords (3) - S3-E13
Factual error: When time is seen rewinding after the destruction of the Paradox Machine, the Earth and Moon are seen rotating and orbiting backwards. The Moon is depicted far closer to Earth than it actually is. (00:37:40)





Answer: Sec was killed and Diagorus wasn't connected to the same system as the dead human experiments. Also technically... Still a Dalek.
jakew25