Since 1963, the journeys of the Time Lord have shown us alien worlds, strange life forms, futuristic technology and mindbending cosmic phenomena. Viewers cowered, terrified of Daleks, were amazed with time travel, and travelled through black holes into other universes and new dimensions.

The breadth and imagination of Doctor Who have made the show a monumental science fiction success. Paul Parsons explains the scientific reality.

Discover:

- Why time travel isn't ruled out by the laws of physics

- The real K-9: the robot assistant for space travellers built by NASA

- How genetic engineering is being used to breed Dalek-like designer life forms

- Why before long we could all be regenerating like a Time Lord

- The medical truth about the Doctor's two hearts, and the real creature with five.