What is the Dr. Who episode where K-9 first appears?

Answer 1

Debuting in the 1977 serial The Invisible Enemy, the first K-9 was the creation of Professor Marius, a scientist working for the Bi-Al Foundation which was built on an asteroid near Titan in the year 5000. A mobile computer, K-9 was constructed in the shape of a dog as a substitute for the one Marius had left back on Earth. Highly intelligent, with an extensive database and equipped with sophisticated sensors as well as a laser weapon built into its nose, K-9 was instrumental in helping the Fourth Doctor and Leela defeat a sentient virus. At the end of the story, Marius suggested that K-9 join the Doctor on his travels.
K-9 was the brainchild of writers Bob Baker and David Martin. Its purpose was to have a character that could narrate while the miniaturised clones of the Doctor and Leela were inside the Doctor's body during the events of The Invisible Enemy. Martin's own dog had also been recently run over by a car, and K-9 was a car-proof tribute to it.
K-9 was not originally intended to be a companion, but producer Graham Williams liked the concept so much that the decision was made to retain it as a regular character. The original name for the character was "FIDO" — apparently from "Phenomenal (sic) Indication Data Observation" unit — but it was eventually named K-9 (a play on "canine").

Answer 2

He first appeared in an old Tom Baker serial from the 70s called 'The Invisible Enemy'.

Answer 3

Wow ya got me but wasn't it the 3 or 4 one The tall one with the long scarf, the one best known in the US.

Answer 4

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