“Mauve alert was the universally recognised colour for danger, signifying the highest level of...Mauve alert
“Yellow alert was an alert of danger. Demons Run was placed in yellow alert as the Eleventh...Yellow alert
“Code Nine was a priority alarm initiated when computer software — activated on the release of...Code Nine
“Red alert was used by humans to signify the highest level of danger. When the Ninth Doctor and...Red alert
The following 19 pages are in this category, out of 19 total.