Hartnell Down

"Hartnell Down" is a colloquial term originating from the British TV series "Doctor Who," referring to a moment when actor William Hartnell, who played the First Doctor, was unable to perform due to health issues or other reasons. In a broader context, it’s used metaphorically to describe a situation where a key figure, leader, or component temporarily becomes unavailable or incapacitated, impacting the normal functioning of an organization or activity until they recover or are replaced. This term highlights the importance of resilience and contingency planning during unexpected absences.