The initial dark, red-tinted first-person view with a weapon.

The ad opens with a dark, red-tinted first-person view of a weapon, then transitions to a character running in a similar environment. It then shifts to a brighter, foggy outdoor scene with industrial structures and a character aiming a weapon. The game's title, 'MARATHON', appears in large, neon green text. This is followed by abstract, glitchy visuals and then a more colorful, interior scene with bunk beds and game-like graphics. Another first-person perspective shows a character in a beam of light, followed by gameplay footage of shooting. The ad concludes with the title 'MARATHON' again, along with platform availability and release information.