Xenophobia was the fear and/or hatred of strangers, foreigners and aliens.
On Skaro, Ian Chesterton recognised that the Daleks were intensely xenophobic, describing their hatred of the Thals as a "dislike for the unlike". (TV: "The Ambush")
The Seventh Doctor described the 1950s as the height of American xenophobia as a result of the Cold War. (COMIC: The Good Soldier)
In the year 200,000, the Jagrafess manipulated humanity into becoming increasingly xenophobic. (TV: The Long Game)
The Inter Minorians became xenophobic after the Great Space Plague had been brought to their homeworld, Inter Minor. (TV: Carnival of Monsters)
In the late 22nd century, a political group called Earth United was created by xenophobic humans to prevent aliens from re-invading Earth after the Dalek invasion. (AUDIO: An Earthly Child)