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virus (disambiguation)for other, similarly-named pages.
Computer viruses were software programs used to infect computers for various reasons, usually malicious. The Ninth Doctor gave Mickey Smith a computer virus that would erase all evidence of his existence from the Internet. (TV: World War Three)
The Eleventh Doctor wrote a computer virus on a mobile phone. It caused all computers and networks to reset their counters and display only the number zero, to alert the Atraxi of Prisoner Zero's presence. It was also, according to the Doctor, "a tiny bit alive". (TV: The Eleventh Hour)
In 2009 Ian Webster created the locust virus to take control over his former bullies. The Umorgus wanted to use the virus to take control over the whole world. The virus was destroyed by Sarah Jane Smith and her friends. (AUDIO: Deadly Download)