The random alien landed on earth and than he goese somewhere else.
Infact that vash and doomer are chilling in the woods and than..... they saw sonething bonding and doomer felt it and he became sleeper symbiote.
Vash was shocked and when he looks at the biggest symbiote vahs said.
-vash
"Oh.My.God! You are a giant baby alien!"
-sleeper
"I am sleeper son of venom and brother of carnage and i am here to save your world because your brother knives hired other villains to destroy and kill others including your friend red, chuck, jay, steve, sans and carl! And ge might gknna kill you too and including the doomer"
-vash
"Knives plan a.... WHAT?!"
-sleeper
"Yeah your brother! No anyways, doomer... your out now!"
And than sleeper transformed back into doomer and so... vash and doomer will warned red, chuck, jay and steve, carl and sans abiut knives plans and so he will go to carl and they will fight both douchebag ipkiss and homelander