22 episodes were originally broadcast in 1976
On the planet Karn, Dr Solon is secretly hiding the living brain of the Time Lord criminal, Morbius.
The Doctor is a prisoner of the Sisterhood of Karn who intend to burn him at the stake.
Sarah has been blinded and the Doctor asks the Sisterhood for help.
Morbius, housed in a terrifying new body, lives and breathes once more.
The Doctor learns of the discovery of two alien seed pods in the Antarctic.
Scorby and Keeler have been sent to steal the alien pod and are willing to resort to murder to cover their tracks.
The Doctor and Sarah track down the remaining Krynoid pod to the estate of Harrison Chase.
Keeler has been infected by the alien pod and is transforming into a Krynoid.
The Krynoid demands that the Doctor be surrendered to it. But the Doctor escapes to seek help.
The Doctor, Sarah and Scorby are hunted down by the mad Harrison Chase.
The Doctor and Sarah arrive in Renaissance Italy unaware that they have brought with them.
The Mandragora energy combines forces with the secret Brotherhood of Demnos.
Hieronymous plots to eliminate the threat posed by the Doctor and uses an unwitting Sarah as his weapon.
As the leading scholars of the era assemble in the palace for the masque, Mandragora prepares to attack.
Sarah Jane is knocked unconscious by a rock-breaking explosion and is taken to hospital.
The fossilised hand is now in the possession of a technician called Driscoll at Nunton Power Station.
Eldrad persuades the Doctor to take him back to Kastria, so that he might reclaim his heritage.
Eldrad reconfigures his body to its final, male form. Furious with finding his world dead.
After a premonition of murder, the Doctor returns home to Gallifrey.
The Time Lord president has been assassinated and the Doctor is the prime suspect.
The Doctor has entered the computation Matrix to prove his innocence.
The Doctor has won his fight in the Matrix and revealed the assassin.