Object
Knife in the Helmeted Man's Back
A murder weapon embedded in a helmeted victim during The Dalek Invasion of Earth, confirming deliberate violence and prompting the Doctor to abort the investigation due to immediate peril.
2 appearances
Purpose
Murder weapon—stabbed fatally into the victim's back
Significance
Provides first hard proof of targeted killing in the abandoned city, escalates unseen threats, and drives the Doctor to abandon the site for group reunion
Appearances in the Narrative
When this object appears and how it's used