cybermen		The monsters in Doctor Who that used gas.
gelth		The monsters in Doctor Who that made a lot of gas.
beast		The monsters in Doctor Who that were possesed by the Beast.
cassandra		The monsters in Doctor Who in the episode called 'Tooth and Claw'.
autons		The monsters in Doctor Who that is said to be the scariest.
sycorax		The monsters in Doctor Who that took over a school.
reapers		The monsters in Doctor Who that controlled people with blood.
daleks		The monster in Doctor Who that said 'delete'.
krillitanes		The monster in Doctor Who that was flat.
slitheen		The monster in Doctor Who that was imprisoned on a planet near a black hole.
ood		The monsters in Doctor Who that disguised themselves as Santas.
werewolf		The monsters in the old Doctor Who that when they took their helmet off the head was the same size as the helmet.
sontaran		The monsters in Doctor Who that were mannequins.
pilotfish		The monsters in Doctor Who that needed Madame De Pompadour.
clockworkdroids		The monsters in Doctor Who that were in the church with Rose's dad.