K-9
The Doctor’s robotic pet K-9 was a companion like none other, the Robot dog spawned a slew of merchandise and his own spin off during his tenure. He was also the only “second wave” character to be released by Denys Fisher, who obviously realised his sales potential.
K-9 was introduced in the serial "The Invisible Enemy" and
stayed with Tom Baker almost to the very end.
Boxed Denys Fisher K-9 courtesy of Bill Frost.
Watch out for the Palitoy talking K9, it is
made by Tomy and has nothing to do with this line..
The Palitoy K-9 is much larger and easily distinguished.