The Science of Doctor Who

The Doctor can travel from the prehistoric Mesozoic era to the Renaissance era and still make it back to present-day Earth before humans begin the evening commute. But could the science-fiction adventures actually hold some sort of science fact?

In special feature content in Doctor Who: The Complete Seventh Series ($80) DVD box set, scientists theorize about the old scientific wonder that could make the TARDIS move through space and time: the wormhole.