Shakri ship
From Tardis Wiki, the free Doctor Who reference
This Shakri Ship was the ship used by the specific holographic image of a Shakri. It was used to deposit small black cubes on the Earth's surface in order to confuse humans and then kill them by inducing heart attacks in anyone within range.
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This ship was destroyed at the end of the episode as a side effect of the Doctor using the cubes to revive all the humans who had suffered heart attacks.