Doctor Who: EVERY Fifteenth Doctor Episode Ranked Worst To Best

4. Boom

Steven Moffat's return to Doctor Who gave us Boom, the tight-paced, tense third episode in series one. The Doctor is stuck with his foot on a landmine, there's almost nothing that Ruby can do about it, and doesn't that soldier look a little familiar? Oh, wait, spoilers.

The episode does what Doctor Who is best known for - it makes you think, it holds you until the closing credits, and it drips enough mystery to keep you guessing. It does set up one of the most bonkers lines of the show to date (ambulance, anyone?) but also reintroduces Villengard, an organisation that Moffat invented back in The Empty Child and The Doctor Dances.

Millie Gibson is given plenty to do as she tries to save the Doctor, those soldiers face horrific fates (who hurt you, Steven?), and the climax delivers. Boom is an all-timer for the franchise, as well as a shiny moment in Moffat's impressive C.V.