Powers/Strengths - Fireballs, absorption of heat/fire.
Weaknesses - Excess water.
Wildmutt
More animal than humanoid, he is a beastly alien with superhuman athletic abilities, and heightened senses of smell, hearing, and taste. He can also fire the quills on his back as projectiles with incredible accuracy. Even though he has no eyes, his lack of vision is supplemented by his hearing and smell, which works almost as well as actual vision (which appear as red figures against a green backdrop). Wildmutt cannot communicate verbally, but can growl, grunt, and make other similar noises.
Powers/Strengths - Sharp quills, athletic ability, heightened senses of smell, hearing, and taste.
Weaknesses - No sound or smell in surrounding areas.
Diamond Head
He's a crystalline alien whose body is harder than diamond, making him invulnerable to most physical attacks and allowing him to cut and slash through almost anything. He can also use his body to refract light and beam based weapons.
Powers/Strengths - Razor-sharp diamond shards, can refract light/beam-based weapons, ability to morph certain parts of his body into extremely sharp tools/weapons.
Weaknesses - Sonic-based attacks/weapons.
XLR8
As the name states (pronounced like "accelerate"), he's a lizard-like alien that has the power to manipulate friction in order to gain acceleration, allowing him to move at incredible speeds. He may be fast, but he is not very strong compared to the other alien forms.
Powers/Strengths - Super speed (300 mph), able to manipulate friction, ability to run on almost any surface.
Weaknesses - Magnetic-based attacks/weapons.
Grey Matter
At a mere five inches tall, he's part of an alien race bred to enter complex machines and repair them from the inside. Consequently, he can squeeze through extremely small spaces. He's extremely smart, which gives Ben a boost in intelligence when he's in this form.
Powers/Strengths - Enhanced intelligence, ability to squeeze through small spaces, slimy skin allowing him to climb virtually anything.
Weaknesses - Strength-based opponents/enemies.
Four Arms
At 12-feet tall, he's an alien of extraordinary strength, and can jump high distances. Unfortunately, due to his body mass and his agility is declined and he is very clumsy.
Powers/Strengths - Super strength, armored skin, ability to create sonic waves when all four hands are clapped at once.
Weaknesses - Extremely quick opponents/enemies.
Stinkfly
He's a winged, insectoid alien and expert flier, able to pull off amazing acrobatic moves in midair. He can also take care of himself in flight, using his pincers and tail as weapons, as well as shooting slime from his eye-stalks. Much like Earth insects, he also has a tough exoskeleton, but very thin wings.
Powers/Strengths - Acrobatic flight, six pincer legs, very sharp tail, slime-shooting eye-stalks.
Weaknesses - Poisonous gases and water.
Ripjaws
This aquatic alien form is an extraordinary swimmer since he can breathe underwater and change his legs into a long tail with fins. He's remarkably fast and agile in the water and can fight with his claws or unhinge his powerful jaws to deliver a devastating bite.
Powers/Strengths - Underwater breathing, agility; powerful jaws and sharp claws.
Weaknesses - Dry land.
Upgrade
A biomechanical alien with liquid metallic skin and a system of organic "circuits." He has the ability to merge with any technology and bring it to life with enhanced abilities.
Powers/Strengths - Positronic energy blasts, ability to merge with and upgrade technology.
Weaknesses - Corrosives (acids) and electromagnetic energy.
Ghostfreak
A shadowy, phantom-like alien that has the ability to phase through solid objects, such as walls, and become invisible at will. Ghostfreak also exhibits limited telepathic and telekinetic abilities. He only has one eye, but can position it almost anywhere on his body by moving it along a track traced on his skin.
Powers/Strengths - Intangibility, invisibility, flight, telepathy, and telekinesis.
Weaknesses - Direct light.
