Let’s Kill Hitler: Prequel - by Steven Moffat Starring: Matt Smith & Karen Gillan Prequel to Let's Kill Hitler. The adventure continues in this prequel written by Steven Moffat... The battle of Demon's Run has been fought. Now return to the TARDIS to discover a little of what happened next. Doctor Who belongs to the BBC. This video is for critical and educational purposes only and is protected under fair use. Be sure to comment and subscribe!