In Aliens Save the Planet, aliens are back. This time they are testing the air and trying to clean the planet. Of course the Men in Black are back too and they have a mission to catch and destroy the aliens. Things get complicated however when one of the Men in Black falls in love with one of the aliens.

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Aliens Save the Planet is a continuation of the very popular Alien Grammar Show. The show involves a lot of direct contact with the audience. There is also a grammar theme, this time a simple reminder to use 's' in the third person of present simple verb forms and also to use the auxilliary verb 'do' when forming negatives.