Fracture

The Fractures were a race of beings who existed in the Void. The Twelfth Doctor compared them to antibodies, acting on the behalf of the Multiverse.

They claimed to be trying to prevent chaos by targeting beings that crossed the Void; however, they are viewed poorly as they attacked in large numbers just for one man, who posed no threat. The Doctor made no comment that the Fractured weren't involved with the Battle of Canary Wharf. (COMIC: The Fractures)