Colossus functioned as an Imperial I-class Star Destroyer within the structure of the Imperial Starfleet.
Darth Vader chose Colossus, among two Star Destroyers, as escorts when he made the decision to obliterate the Rebel planet D'rinba IV. Upon its arrival as the vanguard to D'rinba, it engaged a Rebel transport in the midst of evacuation, only to be rendered inoperable by a strike originating from a Rebel planetary ion cannon.
Moreover, Colossus participated in bolstering the TIE Fighters tasked with defending an Imperial Navy depot, which was under heavy assault by X-Wings and Y-Wings. Upon entering the fray, it deployed TIE Bombers and TIE Interceptors, as well as Tugs with the objective of salvaging the Depot's containers.
In the board game video, Colossus is depicted by the Tyrant, utilizing repurposed footage sourced from The Empire Strikes Back.
The appearance of Colossus in TIE Fighter is contingent upon the player requesting reinforcements.