As they drew nearer and touched the ore, its effects seemed to get even more noticeable. They began to feel a change in themselves, they were getting stronger, more powerful... and more evil.
They became the first of the Corrupted Spacemen, who were transformed by the ore. The Black Transparent ore contains some kind of dark antimatter which warps, twists and corrupts anything near it. The Blacktron Spacemen absorbed the biggest portion of the ore's power, and are therefore the most powerful and most evil of the Corrupted Spacemen. Their powers and abilities are far beyond those of their original forms. Their bodies have been transformed into a form of plasma, which is contained inside their spacesuits. The BT ore affects inorganic matter as well their weapons have also became transformed into more powerful forms.
As time went other, other spacemen from various places found their way to the planet Brimstone, not knowing what lurked on the planet's surface. Very few returned. The Corrupted Spacemen tried to get others to join them by absorbing BT antimatter as they had. The few who did became plasma based entities like the corrupted Blacktrons, but in a slightly weaker form. The majority of other explorers, however, tried to resist, and were killed. Afterwards, their corpses were exposed to the BT antimatter, creating the Undead Corrupted Spacemen, who are evil space skeletons. They are weaker than the living Corrupted Spacemen, but are far more numerous, and still very deadly.
The BT antimatter strengthens someone's natural abilities in addition to making them more evil. Those who were good with ranged weapons become more proficient with them, those who are skilled with melee weapons become better with them, and so forth.
More Undead Corrupted Spacemen. These ones are stealthier, and carry a kind of RT plasma rifle.
The few survivors quickly fled back to their planets, never to return. As their tales of these monsters made it back to neighboring systems, there was a general consensus that something had to be done to prevent this evil from spreading across the universe. Somehow the Corrupted Spacemen hadn't managed to get their hands on any space ships yet, but if they managed to corrupt one, things could get ugly very fast. Someone had to go back to planet Brimstone and eradicate this threat, or at least contain them until a solution could be found, (like how exactly they could kill plasma based entities.)
Only one company of mercenaries was foolhardy (and money hungry) enough to volunteer for the job, the Space Sharks:
These are the pilots and other members who won't (hopefully) see much front line combat. However, they are issued plasma shotguns just in case.
Standard Space Shark infantry. They wear power suits, which in addition to giving them extra armor, gives them increased strength as well, at the cost of decreased mobility. They wield laser rifles with buzzsaw bayonets attached for when enemies get too close.
The close combat troopers use combination chainsaw/flamethrowers.
The leader of the Space Sharks, Captain Bruce "Jaws" Johnson, who either gets his name from having chewed out someone's jugular in a fight, or from the way that he chews out his subordinates when they screw up, depending on who you ask. He is an experienced soldier who has been in many battles. He wields a heavy caliber HMG with an OTC bayonet.
He drives a Tigershark hovercycle, which is equipped with dual HMGs.
This is the front view of the Hammerhead Assault Shuttle, which deploys the Space Sharks into combat zones.
Passengers enter through a large door in the rear of the ship.
The Hammerhead technically seats four, with extra room for equipment, but it can also carry an extra 4 troopers in powersuits and their weapons. It is a well armored ship, which even has an OT windshield for added protection. The only real weakness is a lack of mobility. "But what about weapons?" you might comment, "It looks like it's pretty defenseless against attacks from other ships." the answer to this is that looks can be decieving:
The Hammerhead is armed with 24 YT plasma rockets, two large rockets , and two smaller multi-shot rocket launchers. It's pretty capable of defending itself.
Having established a forward base of operations, will the advance team of Space Sharks succeed in keeping the forces of the Corrupted Spacemen at bay, or will they be overrun? More news on this story as it develops.
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NUuuuuugh! *poop!* ...ahhh! 
That stuff's pure Evuuul!