As the final season begins, Samantha and Darrin take another vacation- all around Europe. Their vacation begins in the Tower of London where they are taking a tour. As they are touring, Samantha gets a call from one of the paintings- a nobleman on horseback. It seems that an evil witch had placed a curse on the nobleman, trapping him into a painting for a thousand years. The witch and the noble were destined to be married during Henry VIII's reign, forgetting that he was already married, the reason why he was placed in the painting. Being a nice person, Samantha lets him out. The moment he is released, the evil witch Malvina the Terrible appears. As punishment for breaking the curse, Malvina sends Samantha back to Henry VIII's time period. Once there, Samantha forgets who she is or why she is there. She comes across a group of instrument players and joins them in entertaining the infamous king, who falls for her. Darrin gets Endora to help him find Sam and save her with a kiss so she c
One member of a mystery-writing-team decides to kill his more talented partner when the better writer decides to go solo.
A police chief who is confined to a wheelchair and a former cop who is now a priest team up to discover who has been committing a series of murders of local priests. (Note: This was a crossover episode for the short lived series "Sarge" starring George Kennedy)
While searching for a pair of murderers, the trio uncovers a link between murder, a stolen car and a threatened epidemic.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
Kitty is in a stage wreck and dazed and confused she sets out in the wild. Meeting up with a wild girl who does not speak, she winds up at a shack where a family takes her and the wild girl hostage. Intent on turning the child into a sideshow, they tie Kitty up but are stopped before they can get too far.
A mysterious dome is found under the sea, that at first looks like the Moon crashed into the ocean. Inside the dome, they find duplicates of SHADO HQ personnel, using non-alien technology - cassette tape recorders - to imitate SHADO instructions to Moonbase and Skydiver.
A UFO hides in a lake on a country estate of a well-known equestrian, and the equestrian himself vanishes. When SHADO tracks down the UFO and manages to destroy it in an exchange of pot-shots, the UFO breaks up and leaves a thing floating in the water. Treated as if it is a bomb, it is brought back to SHADO and examined, with unexpected results.
A flashback episode in which Straker recalls his marriage, followed by stormy days as he must work covertly to get SHADO up and running and recruit personnel. All this leaves his wife angry at his absence, suspicious at the things he might be doing (her father photographs Straker meeting a woman in a parking garage, a woman who will be working at SHADO). In the end, she gives birth to their son.
The Master decides to sacrifice Jo to Azal and when the Doctor and his friends try to intervene they come under attack from Bok.
The Master orders Bert to set a trap for the Doctor at the village while a concussed Jo makes for the cavern.
The Doctor explains to his friends that the Master is trying to gain the power of the last of the Daemons, a race who influenced Earth's development, while the Master brings the rest of the village under his control.
With the Doctor frozen by the energy release from the barrow, Jo calls Yates and Benton for help, but when the Brigadier tries to join them he finds the village surrounded by a heat barrier.
Earth, the near future. When an archaological dig at the village of Devil's End goes disastrously wrong, an ancient power begins to revive. Can even the Doctor withstand the power of the Daemons? And just what is the local vicar up to in his spare time?
The Doctor and the Master are taken into the Primitive city, where the Master hopes to find the doomsday weapon, while Dent forces the colonists to leave the planet even though their ship is likely to explode.