Doctor Who episode 347: Planet of the Daleks – Episode Four (28/4/1973)
One thing I really like about Planet of the Daleks is its focus on the utter, relentless horror of the Daleks themselves. They cut through a solid metal door, quickly discover the Doctor’s escape route up the ventilation shaft, send a squad out to locate and destroy the Thal bombs and intercept the escapers at the top of the shaft, send a Dalek to elevate up after their enemies (belying Revelation and Remembrance‘s claims to have been the first to feature flying Daleks), and develop a deadly bacteria to wipe out all life on Spiridon just out of spitefulness towards the little band of rebels. There’s something quite Michael Myers about this unremitting pursuit and destruction that reminds us how brilliantly horrible an invention the Daleks are.