While dealing with a TARDIS-related mystery, the Doctor encounters a masked pyromaniac. Also includes two back up stories featuring Sontarans and the Celestial Toymaker.
In this found footage-style episode, the Doctor and Clara arrive on a space station overrun by sand monsters.
In the only Doctor Who story to not have the Doctor, a couple astronauts find a secret Dalek base on the planet Kembel.
The Doctor and new companions Ben and Polly arrive in 17th century Cornwall and get caught up with a group of pirates searching for hidden treasure.
The Doctor reunites with Ashildr, now calling herself Me, and gets involved in a plot involving an amulet and a lion guy.