Part of the fun of watching old #DoctorWho is rating the action shots of the robot dog K9 on a scale of 1 to 10 where 1 is "they just pulled him along with string" and 10 is "wow he actually turned a corner under his own power and only bumped into a few things". I rate this shot from "The Invasion of Time" (1978) a very high 8/10 for K9 dexterity.