Doctor Who: 10 Cheapest NuWho Enemies

10. Santa Robots

David Tennant's Tenth Gallifreyan arrived amongst a mass of killer baubles and narky Sycoraxes in the yuletide treat that was 2005's The Christmas Invasion. Yet while spectacular sights, such as the TARDIS crash landing on a council estate and a bloodthirsty-looking alien race, were in abundance, other aspects of the episode left less of an impression.

True, the climactic swordfight between the Doctor and the Sycorax leader had all the tension of two drunks slapping each other with rolled-up newspapers on a park bench, but an unmistakably festive threat becomes the introductory entry on this ragtag rundown. 

The Santa Robots were a stroll in the positronic park for the production team. Simply dress an actor as a department store Father Christmas and shove a novelty mask on his face. Oh, and give him a lethal trumpet. The simple but marginally effective trick was repeated in The Runaway Bride, where once again the marauding mechanoids played support to a more expensive adversary.