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This review is from: Doctor Who: K9 Tales Box Set (Invisible Enemy/K9 and Co) [DVD] (DVD)
"The Invisible Enemy" is a typical Tom Baker episode with the lovely Leela (October 1977). Includes the trendy (at the time) miniaturisation and injection into the body idea along with the current brain model concepts. This is the first time the Doctor meets K9. One bad mistake is when Leela kicks part of the Doctor's brain and it hurts him - since the brain feels no pain in itself, this is a bit dodgy; unless the Doctor's different anatomical features include this difference!
"K9 and Company (a girl's best friend)" is a one-off special (28 December 1981) with no Doctor, when SarahJane meets K9 for the first time. A rather terrible black-arts cult story, but fun nevertheless. I don't think this epsiode features much amongst the endless Dr Who repeats, so it is an excellent addition to the DVD collection.
The DVD extras are good as well, as is now usual for the Doctor Who releases.
Thoroughly recommend this set.