Handles

 was the nickname given to a Cyberman head repaired by the Eleventh Doctor after he got it in the Maldovarium Market, which went on many adventures with him as he searched the mysterious Trenzalore.

When the Doctor ended up staying in Christmas for many years, Handles was his only companion for three hundred years. Before shutting down it finally fulfilled an order the Doctor had given it prior to landing on Trenzalore – an order to tell the Doctor to patch the TARDIS phone back to the console. Handles' death reduced the Doctor to tears.