I'm thinking something along the lines of below... yes I know some of it is mighty freggin cliche
Scene opens with a young cadet getting out of a simulation pod after scoring top marks, however once his head leaves the pod a person carrying a recently excavated alien sensor array with self contained power source and intelligent AI stumbles sending the device flying and slamming into the head of the cadet.
<zoom to 3rd person>
We then see the cadet drop to his knees while falling out of the pod and making the futile attempt to stay conscious then stand up, resulting in him falling to the floor and getting wheeled to infirmary
<zoom to first person scene that's fully black with a light moving towards the cadet>
Unknown entity: Hello young man, I know you have a LOT of questions but we don't have time so just listen closely...
To protect my home, I had to use a large bomb which may have been a bit too powerful, so um yeah I may have changed your past and path to a potential future... sorry about that...
<multiple lights fly by>
Smaller spheres of lights: Beware! The Ultimate Evil can see us! We must run away and hide again! The Shield isn't enough!
Unknown entity: Don't mind them, they're just fearful of everything including their own shadows... now where was I...
Oh right, the bomb... kid you have potential and in another time and space you're my ancestor so I need to help you out. We humans may be weak and have inferior technology, but others fear how we can bond with other cultures while making friends from enemies which will make them want to exterminate you before it can happen...
<beam of light passes between the MC & unknown entity>
Unknown Entity: Time's up! Mars is under attack, wake up!
<scene starts to fade>
Unknown Entity: Remember, make many allies and rely upon the strength of your friends, the fate of ... will... depend... on it
<as the scene fades more the entity looks more and more like an older version of the MC>
<New Scene, eyes blinking looking up at the infirmary ceiling with the captain of the starbase looking down at the MC>
Captain!
<MC jumps to feet>
Mars is under attack! Get everyone...
<Beam of light impacts Mars causing it to destabilize and explode like Icarus base from Stargate Universe>
I... I... was too late
<Cadet slumps down>
Captain: Cadet I'm going to need to know exactly what you saw when you were unconscious, and why our best doctors and scientists thought you were both brain dead in areas and highly active in other areas at the same time.
<Cadet starts to tell the captain what he saw and what knowledge was imparted into him>
<Roll intro credits beside a scene of the Captain showing the Cadet the experimental ship she's going to have him fly>