Doctor Who: 10 Villains Who Should Return For Russell T Davies' New Series
2. The Ood
To borrow another Eleventh Doctor quote: "Oh it's an Ood! Love an Ood!"
Though the Ood flit between being good guys and bad guys, they're at their best when they're in evil mode, and it's been a long time since we've seen that happen.
Their debut appearance in Series 2 saw them portrayed as harmless slaves who were corrupted by the Beast, causing them to turn violent. Series 4's Planet of the Ood was a similar tale, with the Ood murdering their human overlords thanks to the Ood Brain exerting its rather angry influence. And then, there was The Doctor's Wife, where a lone Ood hunted the Ponds through the dark, maze-like corridors of the TARDIS.
The Ood were incredibly creepy on all three of those occasions, but with The Doctor's Wife now 11 years old, it's been a while since we've seen them in full-on villain mode - so it's definitely time for that to happen again.
RTD's previous Ood stories have been thematically rich as well as highly entertaining, so they're a great monster for him to work with. His writing has only got better and more insightful in the years since he left Doctor Who, so the story of an oppressed slave race starting to rebel would be fascinating to see him tackle today.