Recap: Doctor Who S4 E7 "The Macra Terror"

"This is an emergency! Control must be believed and obeyed! No-one in the colony believes in Macra! There is no such thing as Macra! Macra do not exist! There are no Macra!"
Control (protesting too much)

The TARDIS arrives at a human colony that seems happy enough but, as it turns out, the colonists are being mind-controlled by a race of giant crabs called the Macra. The Macra are using the humans to mine the toxic gases they need to survive.

Ben is affected by the Macra mind-control and starts to turn against the others, but the Doctor succeeds in breaking their hold and Ben destroys the gas-mining equipment, killing the Macra and freeing the colonists.

The Macra had a slightly surprising cameo four decades later in the Tenth Doctor episode "Gridlock".


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