Doctor Who: William Hartnell’s 10 Best Episodes

9. The Space Museum

Episode: Season 2, Episode 7

Companions: Barbara Wright, Ian Chesterton, Susan Foreman

The TARDIS lands on the planet Xeros, where the Doctor and his crew find a "Space Museum" containing artifacts such as a Dalek. The TARDIS apparently skipped a time track and they find their future selves on display in an exhibit. Time then reverts to normal and the crew determines that they must do all they can to change the future. This episode brought forth the idea of time being a dimension in the show, it also challenges the idea of time travel and what can be re-written. Throughout the entire episode the crew is conflicted with the idea of fate, and how to change it. The Doctor rarely goes into how it worked out in the end and regarded it as "time and relative dimensions!" in more modern terms we can understand that that really means "wibily wobily, timey wimey!" Though the show doesn't have a strict rule of how the science of time travel works, the show stays true that minor events can be changed, however certain things will never change, no matter how hard you try to prevent it.