Following mysterious bright lights in the sky, the human race is rendered blind and helpless. The survivors find themselves stalked by sentient flesh-eating plants.
A story of unrequited love set in 1930s London, against the backdrop of grimy streets and public houses.
After an encounter with the Master, an airline stewardess named Tegan Jovanka becomes an unwitting stowaway aboard the TARDIS as it travels to the planet Logopolis. There, the Doctor discovers that the Master's interference with the Logopolitans' advanced mathematics has unleashed a wave of entropy which threatens to consume the entire universe.
