Handles

 was the name given by the Eleventh Doctor to a Cyberman head that he had obtained from the Maldovarium Market, and subsequently repaired. It went on many adventures with him as he searched the mysterious Trenzalore.

Outliving the residents he had chosen to protect, Handles was the Doctor's only companion during his first three hundred years in Christmas. Before shutting down, it finally fulfilled an order the Doctor had given it prior to landing on Trenzalore: reminding the Doctor to patch the TARDIS phone back to the console. Handles' death reduced the Doctor to tears. (TV: The Time of the Doctor)