Asteroid Dragon

The Asteroid Dragon or "Rock Knucker" is a predator found on rocky moons and rugged worlds along the fringes of known space. How these monsters have managed to make it to so many worlds is a mystery, but the prevailing theory is that big game hunters and zookeepers have transported them for their own purposes. These monsters are a particular nuisance to colonists, as asteroid dragons are rapacious predators that will eat anything and everything they can catch.
Asteroid dragons are 16-25ft long reptilian monsters somewhat resembling a dinosaur or dragon from legend. Though reptilian in form, asteroid dragons are warm-blooded, allowing them to hunt a wide range of habitats, though they hate damp places such as forests and swamps.
Thankfully, these creatures are amazingly stupid, and can easily be baffled with electric fences and other tricks. The remarkable metabolism of an asteroid dragon renders it an immunity to all known poisons and disease, though they are host to a dreadful variety of harmfully septic bacteria.
AC: 20, HD: 12d8, THB: +12, Att: 2D6/2d6/3d8, ST: 7+ (Survival), MV: 6, SPC: Cause Fear, Disease, Immunity (Disease, Poison), Stupidity. XP: 1,000

Story Possibilities

Space Ranchers

An asteroid dragon has been stalking a herd of terran cattle on the outskirts of a colonial settlement. The big lizard has been nabbing cows, eating them bones, horns hooves and all to the distress of the local ranchers. The X-Plorers team is contracted to find and kill the beast.

Big Game Hunter

A corporate executive who likes to play big game hunter has hired the X-Plorers team to help him bag an Asteroid Dragon to mount on his wall. The players characters not only have to find a wild Asteroid Dragon, they need to "help" the exec make a kill without killing the beast themselves. 

To make this even more difflicult, the exec isn't a very good shot, preferring flashy guns and high-tech gear to actual skill. So the team has to not only worry about the beast, but their employers collateral damage as well.

Happy hunting!

Ravening Beetlebeast

Lurking on remote asteroids and lonely moons, the dreaded Beetlebeast stalks anything even remotely edible. These monsters will happily munch upon asteroid miners, algae, plastics, or anything else unfortunate to get caught. Beetlebeasts can survive in vacuum environments and are highly resistant to radiation, leading some specialists to surmise that they are the product of genetic engineering by some unknown alien race.
Beetlebeasts are powerful subterranean predators whose ironlike claws allow them to burrow through solid stone in search of prey. Beetlebeasts are tremendously strong, standing nearly 8 feet tall and over 5 feet wide. Muscles bulge beneath their exoskeletons and their powerful arms and legs all carry great claws. They have no necks to speak of, but the head features a powerful maw with 8-inch mandibles capable of biting through any hide, bone or steel and composites. Their eyes are mere blackened dots each the size of a small coin.
For all of their monstrous features, beetlebeasts are intelligent opponents. They lie in wait for passing prey, peeking through a crack they've made, until likely prey walks by. The rock devil then springs out upon its startled victim. When using this technique, opponents have a +4 modifier on their ST for Stealth checks. Other tactics involve planned cave-ins and dead-end tunnels and burrowing up underneath their chosen prey. Their burrowing rate varies from 4 meters per turn in solid stone to 6 meters per turn in soft earth.
AC: 16, HD: 8d6, THB: +8, Att: 3 claws 2d6, claw 2d6 and bite 3d6, St: 11+ (Survival and Stealth), MV: 6 (Burrow 4-6), SPC: Optional Movement (Burrowing), Dark Vision, Immunity to Cold, Radiation Resistance (+8 to save vs. any kind of radiation poisoning),
XP: 150

Notes: My players had a chance run-in with a Rock Devil this past Sunday. It is only due to some fast thinking and accidentally coordinated action allowed them to escape the beast. 

Malkian (Cat People)

The Malkian's (Cat People) are a species of felinoids native to Freya. They also settled on a number of colony worlds and are allied with the UCN, often joining corporate nations as citizen/employees. Malkian have some similarity to the non-humanoid cats of Earth, though they are closer to the size of a human. They have fur in a variety of lengths and colours, including brown, black and tabby stripes. They have retractable claws which they can use for self defense and ritual combat. Malkian voices are often punctuated with sounds like the purring and of cats.
Malkian society is matriarchal, with a council of the wisest and strongest females leading a community. Males typically keep to their own cliques but regularly seek to gain the backing of a powerful female. Technologically, Malkians were comparable to early 20th century Earth (WWII era), but have been catching up quite quickly thanks to their sharp minds and usefulness to the UCN as scouts. Malkians are considered to be the most physically appealing of alien races yet encountered by the UCN, but are considered to be aloof and unfriendly by those who "dont get cats". All Malkians are curious and inquisitive people who take great pride in their appearance.
Restrictions: Malkians will never wear any armor higher than Flex Armor (AC 12). Due to the fact that they have a full coat of fur, they will overheat in a very short time if wearing armor. If a malkian PC puts on any armor higher than Flex Armor, they will faint within one turn. In fact, many malkians do not wear armor at all. Malkian can use force fields.
Attribute Adjustments: +2 AGI (18 max), -2 PRE (3 Min)
Bonuses:  Night vision of up to 30 feet. The retractable claws of Malkians grant them 1d2 damage on all open hand attacks (if a Soldier, increase Martial Arts damage by one die type, so 1d3+1 becomes 1d4+1 and so on). Also the heightened reflexes of Malkian grant them a +1 on initiative checks.

As Creatures
Malkians are intelligent and dangerous opponents as well as skilled scientists, technicians and spies. In combat, Malkians prefer ambush, sabotage and assassination to open battle. Malkians can be found anywhere humans are, often finding work for UCN corporations, UCNP (police), or as Space Pirates. Malkians tend to prefer melee weapons such as swords and sonic swords over firearms, but will sometimes use laser pistols.
AC: 14, HD 2d6, THB +2, Att 2/1d2 or by weapon, ST 15+, MV 8, XP 40

Space Gremlins (Little Green Men)

"So until we all confess
And admit we stole the candy
These little men are playing games
From here to eternity
But I'll be sitting by myself here
Waiting oh so patiently
Waiting for the sky to fall
And purge frail humanity."
-Project 86, Little Green Men
Also known as "Little Green Men," these irritating little aliens have been a source of considerable anxiety for cultures across the known galaxy. They appear, seemingly at random, and without warning. Most times these creatures are merely irritating observers, but other times they seem focused on bedeviling others with their continuous commentary and their sense of humor.
Gremlins measure around 2ft tall, have small torsos; long, frayed limbs; and spherical, bald heads. They have six fingers on each hand, and typically wear boots and trousers. They consider the human race inferior and are both interested and amused by human behavior. As they reproduce asexually, they are particularly repulsed and fascinated by human mating habits, which they will often comment upon at inappropriate tames and at great volume. On rare occasion, Space Gremlins are helpful to others offering advise or other aid, but the recipients of such "help" are rarely overjoyed during the process.
Intelligence 3d6+2 (18 max), Physique 3d6-2 (3 min)
AC 10, HD 1d4 (2 hp), THB +0, ATT 1d3 or by weapon (see below), ST 13+, MV 3, SPC Dark Vision, Clairvoyance, XP 25
Clairvoyance: Space Gremlins are all considered to be psychic as per the rules found on page 32 and 33 of the X-Plorers rulebook. All members of this species possess the powers of Clairvoyance, even if they lack the prerequisites.

Space Gremlin Equipment
Space Gremlins use a variety of gadgets particular to their kind. These devices only work for Space Gremlins and psychic beings, using the characters psychic skill to activate). Here are a few favorites:
Anti-Gravity Belt (600cr*): This device allows the Gremlin to float as though weightless. While wearing such a belt the Gremlin can fly at MV 8, and can carry 2x its normal weight allowance.
Psychic Lash (1,200 cr*): This nasty weapon emits a blast of head splitting psionic energy as the Mind Blast Telepathy power. The device itself looks like a crystal or gem mounted on a wand or staff.
Flying Saucer (30-60 million credits*): These Class 1 or Class 2 ships resemble classic flying saucers and operate the same as human built ships of the same class. The only difference is that these vessels are completely invisible to all forms of detection other than sight, sound and psychic powers. Flying Saucers only work for Space Gremlins or Psychics.
*Only available from and for Space Gremlins.

USING SPACE GREMLINS
Space gremlins are a pain in the butt, and should be played up as such. Still they are rarely outright malevolent and have been known to befriend small children (who share their sense of humor). Most encounters with Space Gremlins will be as Astral Projections, as these creatures know that other races would happily kill them for their commentary alone.
They will often show up seemingly at random, playing jokes and tattling on others. Sometimes they act as teachers, instructing those they deem "wayward" in the proper course of action.
As Symbiotic Entities: Occasionally a Space Gremlin will become "detached" from his or her body while using its Claivoyance power Projection, effectively becoming stuck in that disembodied state. As per the psychic rules on page 33, Gremlins make for excellent symbiotic entities. Such symbiotic gremlins are happy to have found a new home, but can be difficult room-mates.