Cephalopod

Cephalopods were a type of animal which included octopuses. (TV: Terror of the Autons)

Although Channing claimed that the Nestenes had no individual identity, (TV: Spearhead from Space) the Third Doctor later said that he suspected the Nestenes' basic form was analogous to a cephalopod. (TV: Terror of the Autons)

Ianto Jones described his boyfriend Jack Harkness as being sexually attracted to cephalopods on the same level as both men and woman. (PROSE: The House that Jack Built)

The Bailiffs were cephalopods forms who were weak against ammonia. (COMIC: Mr Nobody)