Mark and Seth return to examine part three of the Tom Baker story Horror of Fang Rock. A mysterious killer is on the prowl inside an old lighthouse. The Doctor and Leela try to formulate a plan to thwart the creature before it kills everybody inside!

Reference material used

* Official BBC site with scans of the original paperwork* Shannon Sullivan’s entry in A Brief History of Time (Travel)* TARDIS Data Core entries for the TV story as well as the novelisation* A Minecraft server dedicated to Doctor Who constructed the lighthouse