Halo 4: Forward Unto Dawn: Mid-Season Trailer
From Halopedia, the Halo wiki
The Halo 4: Forward Unto Dawn: Mid-Season Trailer is a trailer of the live-action series, Halo 4: Forward Unto Dawn. The trailer was posted on Rooster Teeth's YouTube channel on October 21, 2012.  The trailer runs for 1 minute and 20 seconds and shows the events of Episodes 4 and 5.
John-117 walks into frame as sparks fly from the wall.
Various a shot of ODSTs firing at off-screen Covenant before cutting to one stepping out of his/her pod to the door of the Corbulo Academy of Military Science's space elevator closing to a driving Warthog.
A rapid montage of various action scenes and the Chief jumping from a ledge in slow-motion.
"This is Halo live-action done right."
Overhead shot of Corbulo Academy; cut to Colonel K.L. Mehaffey in her office.
"All of the heart that Hollywood game-based movies lack."
Cut to Cadmon Lasky's final video message.
Cut to Lasky in the middle of the chaos of the battle at Corbulo Academy.
Cut to various shots of the cadets.
"Forward Unto Dawn nails it."
Cut to Thomas and Chyler sitting together.
Cut to Lasky getting out of a cryo chamber.
Cut to Lasky in Col. Mehaffey's office.
SEE THE WEB SERIES EVENT EVERYONE IS TALKING ABOUT
Cut to John-117
Cut to a Warthog speeding through a forest. Cut to title: