Star of Mathematical Excellence

Adric won a badge for "mathematical excellence". (TV: Full Circle) It was fashioned in a star shape with gold edges. The Fifth Doctor used this badge to kill a Cyber-Leader within the TARDIS control room; by crushing the badge into its chest unit, the Doctor suffocated the Cyberman before shooting it with a Cyber-gun. (TV: Earthshock)

Behind the scenes

 * In recognition of his death, the closing credits of Earthshock rolled in silence over the broken pieces of Adric's badge.