Lionheart Protocol

The Lionheart Protocol was a UNIT protocol which dictated that, in the event of a senior member going missing for more than three hours, it should be assumed that they have been compromised and any artifact connected to their abduction must be protected.

When Kate Stewart was abducted by the Eleven in 2014 or 2015, the protocol was triggered and the arch was to be removed from Edinburgh. (AUDIO: The Enemy Beyond)