Conversation so far:
What work did Terry Nation do on Doctor Who?
Terry Nation made a significant contribution to the long-running BBC science-fiction series Doctor Who.
What contributions did Terry Nation make to Doctor Who?
Terry Nation made a significant contribution to Doctor Who, creating the villainous Daleks.

Question: What was the name of these villains?
Self-contained rewrite: What was the name of the Doctor Who villains created by Terry Nation?