Code Nine was a priority alarm initiated when computer software — activated on the release of the Emergency Protocols — detected important words.

When Jackie Tyler phoned the BBC alien helpline and told them about the Ninth Doctor and his TARDIS, the words were highlighted and a Code Nine was declared. Indra Ganesh informed General Asquith of this development. Asquith did not understand as he was really a Slitheen impersonating the General. (TV: Aliens of London)

Following the appearance of the Sycorax, Prime Minister Harriet Jones asked UNIT Major Thomas Blake if they had received a Code Nine, any sign of the Doctor. He replied that they had nothing yet. (TV: The Christmas Invasion)

At Torchwood Cardiff, Jack Harkness ordered Code Nine maneuvers as his team engaged a partially converted Cyberman. (TV: Cyberwoman)

Community content is available under CC-BY-SA unless otherwise noted.