As the player is going out for a walk, mysterious pink aliens, the titular Spaliens, have started to invade! The player then gets abducted, but quickly escapes in order to take the fight back to them, going through ships and wreckage along the way.

Spalien Attack was well-received as just a fun and simple mappack, and its use of a Portal element, Excursion Funnels, for platforming was executed nicely. The Spalien series would then grow to include the more puzzle-focused Spalien Escape, and the direct sequel, Spalien Revenge.

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