Exposition in Metroid games makes noname 
Bad juju happens on mysterious planet. Bounty hunter arrives, kicks ass, takes names, gets fun toys, slays evil, leaves. Maybe strips to bikini later, dunno. Lines of dialogue spoken = 0. noname 
(In case I'm being too subtle, this is my innocuous way of saying I'm indifferent to the continuity, and firmly believe that less is more in the Metroid universe. Subtle, huh?)







