Object
David Campbell's Defensive Knife
Critical tool used in the climax of the Dalek invasion to disable a firebomb, directly tied to the bomb disarmament plot and the tension of the warehouse scenes.
3 appearances
Purpose
Pry open Dalek firebomb casing for disarming; serves as personal defense against Robomen and Daleks
Significance
David's injury from the slip forces Susan and him to abandon the Doctor, fracturing the resistance group's unity and escalating stakes as they flee through sewers, planning a later return.
Appearances in the Narrative
When this object appears and how it's used