Luke eventually escapes from the Slitheen but the bigger problem is Mr. Smith, who is trying to kill Sarah Jane and her neighbours. However, help comes from an unexpected quarter, K9, Doctor Who's old robot dog, who now lives with Sarah Jane,and who keeps Mr. Smith busy in combat while Alan prepares the virus that eventually shuts down Mr. Smith and returns him to being Sarah Jane's benevolent helper, whilst the Slitheen escape empty-handed. Written by
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Did You Know?
John Lesson, who is the voice of K9, got his second big computer to computer action fight in this episode when he fights (as K9) with Mr Smith. K9's first fight with a computer was with the robot parrot in the Doctor Who episode, "The Pirate Planet", 1978. K9 was victorious in both battles. See more
The Slitheen don't invade planets they're not a race they're a family. They're a bunch of scavengers and chancers. It's Only Fools And Horses but with green skin and claws.
References The X-Files