As most of us know, the Discover Hope trailer is the opening cinematic for Halo Infinite. At least, up until Chief jumps out of the Pelican. I have a few theories as to what might happen next.
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Chief discovers it is a Guardian and decides to board it. The first mission would be Chief fighting Promethean’s on the Guardian’s surface (maybe even inside it) Chief finds a way to destroy the Guardian. At the last second, Brohammer (or Pilot) picks him up with the Pelican and the two decide to land on the Halo.
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A massive Created fleet has arrived consisting of multiple species. Chief decides the best option is to infiltrate on of the ships and find out what the enemy is up to.
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Turns out, the disturbance is the Spirit of Fire. (Somehow, they have a Slipspace Drive) Badly damaged, the Spirit of Fire is being pursued by Banished forces. (Somehow, the Banished have a ship) Chief boards the Banished ship with Red Team in an effort to save Isabel who has been captured by Atriox. (To be honest, this one makes little sense)
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Just as Chief jumps out of the Pelican, it cuts to Chief on the UNSC Infinity trying out his new armour. Turns out the opening cutscene was a flash-foward and we are learning the events leading up to that moment.