you can`t. you would have had to be in the closed beta to get it.
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The code for the alien mask is UFOMASKEThe code for the alien costume is UFOANZUG
get it from meteoric guardians You can get the Ben 10: Alien Force Jacket from the Meteoric Guardians in Fuses Lair, They are level: 36
go on google images and type in alien x
you will have to get a fusion matter generator for fusionfall
i dont now,maybe,x?