Alien Weapon

An Alien Weapon was wielded by the Ninth Doctor as he attempted to stop Dalek while it fought to escape the Vault, only to lose it as he was defeated by the Dalek, who took the weapon for its own use. As the Dalek approached the Doctor's TARDIS, it found the Doctor had returned to face it with a second weapon. Ultimately, the Dalek succeeded in exterminating the Doctor, proceeding to destroy the TARDIS. (NOTVALID: The Last Dalek)

Behind the scenes
The Alien Weapon was identified in the video game The Last Dalek, based on TV: Dalek. It was acquired in Level 9.

In Dalek, the Doctor found this weapon in a pile that had been collected by Adam Mitchell in the event Henry van Statten attempted to one day dispose of him. The Doctor had intended to use it to kill the eponymous Dalek, only to be stopped by Rose Tyler.