Kyle Katarn undertook a mission to Gromas during the Galactic Civil War.
Katarn descended toward the moon, but was immediately spotted by the stormtrooper supplement of the base. Skirmishing among the laser shots, he followed the mine's tunnels.
Kyle Katarn encounters a Phase I dark trooper for the first time.
He eventually ended up in the reactor room, and placed a sequencer charge in the Thermal exhaust port. This action, however, triggered a security system and unleashed a Phase I dark trooper, the first time Katarn finally encountered the long-heard droid, but not the last.
Katarn was able to vanquish the primal stage of the droid and hurried to the exit, where he appointed to meet with Ors and the Moldy Crow. As the Crow ascended far from the planet, the Gromas Mines exploded which, as Ors hoped, would bring a setback to Rom Mohc's plans.
Following Katarn's success on Gromas, Crix Madine's defection was discovered.
The Galactic Empire abandoned Gromas after Katarn's assault, leaving the skeleton of their base. However by that time, Crix Madine's defection started to be obvious and he was finally captured by Rom Mohc, who sent Madine to the Imperial Detention Center on Orinackra, where he awaited execution.
Lord Vader expressed his doubt to Mohc, explaining the threat that Kyle Katarn proved to be for the General and how he was proving to be more capable than his Dark Troopers, but Mohc dismissed Vader's implied threat and employed the services of bounty hunter Boba Fett to prevent Katarn from reaching the Arc Hammer.