The MC75B Star Cruiser shared a similar hull shape to that of a standard MC75 Star Cruiser, with notable differences being the absence of the bridge extending below the hull and the addition of large fins toward the rear of the vessel. The MC75B also had an additional module in place near the rear engines, giving the rear of the vessel a more bulky appearance. The MC75B was also equipped with a hyperdrive, allowing it to traverse hyperspace on its way to the Unknown Regions.
When Darth Sidious planned to unleash the deadly Sith Fleet upon the galaxy in 35 ABY, many MC75B Star Cruisers were among the massive Citizens' Fleet amassed by General Lando Calrissian to travel to Exegol. During the ensuing battle with the Sith Eternal forces, MC75B Star Cruisers were among the many ships disabled by a massive force lightning attack unleashed by the Sith lord. After the defeat of Sidious at the hands of the Jedi Rey, the remaining Sith forces were defeated and the Citizens' Fleet emerged from the Sith world.
The MC75B Star Cruiser first appeared in the final installment of the Star Wars saga and the sequel trilogy, Star Wars: Episode IX The Rise of Skywalker. It was first identified in an installment of Star Wars By the Numbers on StarWarsKids.com in 2020.