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Originally posted by: Jedikev
What the hell are those movies?

If you are speaking directly to greencapt, I can help with 2 of the 3.

Cat from Outer Space- Along the same lines as the original That Darn Cat. Disney, same time period. Its been a long time since I saw it last, so I'll just grab a IMDB synopsis:
A UFO is stranded on earth and impounded by the US government. Its pilot, a cat with a collar that has special powers, including the ability to allow the cat to communicate with humans, has eluded the authorities and needs the help of a man named Frank in order to reclaim and repair his ship to get back home. Stars Ken Berry and Sandy Duncan.

The Last Starfighter- Oh, I wish I'd thought of this. It really is an underrated Sci-Fi flick.
From IMDB:
Alex Rogan lives in a trailer court where his mother is manager and everyone is like a big extended family. He beats the Starfighter Video Game to the applause of everyone in the court and later that day finds he has been turned down for a scholarship to college. Depressed, he meets Centauri, who introduces himself as a person from the company that made the Game, before Alex really knows what is going on he is on the ride of his life in a "car" flying thru space. Chosen to take the skills he showed on the video game into real combat to protect the galaxy from an invasion. Alex gets as far as the Starfighter base before he really realized that he was conscripted and requests to be taken back home. When he gets back home, he finds a Zan-Do-Zan (Alien Bounty Hunter) is stalking him. Unable to go home and live, Alex returns to the Starfighter base to find all the pilots have been killed and he is the galaxy's only chance to be saved from invasion. To defeat the invaders, who are paying the Bounty on him, He must be victorious.Stars Lance Guest and Robert Preston. 'Before he was well known' appearance by Wil Wheaton.

Krull I don't believe I've ever seen.