"Doctor Who: The Mind of Evil" is a six-part serial
from the Jon Pertwee era, originally broadcast in 1971.
Here's a review primarily based on the script provided on chakoteya.net:

Episode 1: The Doctor and Jo attend a demonstration of the Keller Machine,
a device claimed to remove violent impulses from criminals. However,
the machine's true nature is revealed when it causes death and destruction.
The episode effectively sets up the premise
and introduces the main characters, including the Doctor's nemesis,
the Master. The tension builds as the true threat of the Keller Machine
becomes apparent. Rating: 8/10

Episode 2: The Doctor investigates the origins of the Keller Machine
while UNIT deals with the aftermath of its use. The Master's involvement
deepens the mystery, and the action sequences are engaging. The stakes
feel higher as the Doctor realizes the machine's potential
for mass destruction. Rating: 8/10

Episode 3: The Doctor races against time to stop the Master's plan
involving the Keller Machine and a nerve gas missile. The character
dynamics are well-developed, and the moral dilemmas faced
by the characters add complexity to the story. The suspense continues
to build as the Doctor gets closer to uncovering the truth. Rating: 8/10

Episode 4: The Doctor confronts the Master and tries to prevent
the missile launch. The action sequences are intense, and the resolution
is satisfying. However, some may find the pacing slightly slow
in this episode. Rating: 7/10

Episode 5: The Doctor and UNIT attempt to defuse the nerve gas missile
before it detonates. The tension mounts as they face various obstacles,
including the Master's interference. The emotional stakes are high,
and the climax of the story is thrilling. Rating: 8/10

Episode 6: The Doctor's efforts to stop the missile reach a dramatic
conclusion. The resolution is both satisfying and thought-provoking,
as the Doctor reflects on the nature of evil. The episode sets up
future conflicts between the Doctor and the Master,
hinting at the ongoing struggle between them. Rating: 8/10

Overall, "The Mind of Evil" is a compelling Doctor Who serial
that explores themes of morality, power, and the nature of evil.
Jon Pertwee delivers a strong performance as the Doctor,
and the dynamic between him and Jo Grant adds depth to the narrative.
While some episodes suffer from pacing issues, the overall experience
is enjoyable and thought-provoking. Overall Rating: 7.8/10

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