Alien Species

Osmosians are a subspecies of mutant Humans whose abilities are given by unique genetic components in their DNA. They were originally believed to a be species from the planet "Osmos V" before this information was revealed to be a hoax.



Being a Human subspecies, Osmosians are mostly indistinguishable from regular Humans. However, they can develop black markings around their eyes after absorbing energy.

Artificial Osmosians such as Aggregor have small flesh-colored horns on their forehead.


Osmosians normally eat food to sustain themselves. They prefer savories over sweets.[1]

Osmosians are able to feed off the metabolism and life force of other living beings. However, this method of feeding can easily turn into an addiction, causing the Osmosian to become insatiable and instinctively seek out any possible source of energy to feed off of.

Powers and abilities[]

Osmosians are able to absorb, hold, redirect and discharge virtually any type of energy through their bodies.

As demonstrated by Kevin Levin, Osmosians can absorb the mass and properties of physical materials, coating themselves in the substance which allows them to take on its properties.

While not on the same level as Tetramands or Petrosapiens, Osmosians are naturally stronger and more durable than Humans. These abilities can be proportionally increased to whatever material they have recently absorbed.[2]

When absorbing liquids such as water, Osmosians will gain the properties of that liquid.[2][3]

When absorbing mud, Osmosians can have objects pass through them without causing physical damage.[3]

When absorbing elastic materials, Osmosians can "sort of" become elastic.[2]

Osmosians can regenerate when absorbing certain types of energy.

Osmosians can transform into other beings at will. For example, Devlin Levin can transform into "Devlin 11", a duplicate of Kevin's first major mutation "Kevin 11".

Other substances that Osmosians can use their absorption powers on include bubblegum[3] and fire.[3]

When Osmosians absorb the DNA and life force of other being, they gain that being's powers.


An Osmosian's biggest weakness is their insatiable hunger for energy and becoming mentally unstable, and storing energy for long periods of time will worsen their instability. However, this is normally latent and becomes easier to control if they are mature and have experience with absorbing energy.

If an Osmosian is forcibly drained of the energy they have absorbed, it will present risks to their physical health if they do not seek immediate medical attention due to them living off energy instead of eating and sleeping properly.

By absorbing another being's DNA, Osmosians can only acquire the original creature's powers at 1/10th of their original potency. Any powers an Osmosian has absorbed from other life forms will eventually wear off and disappear. The more they absorb, the longer it will take for these powers to wear off.

The materials an Osmosian absorbs can put them at a disadvantage. For example, absorbing liquids weakens their durability,[2] absorbing metal makes them vulnerable to electricity, and absorbing wood makes them vulnerable to fire.

Regardless of how much DNA an Osmosian absorbs, their own DNA will eventually overwrite the absorbed DNA in time, causing them to lose absorbed powers unless they keep reabsorbing to keep it from happening.



  • The name "Osmosian" is a play on the word "osmosis", the physical process by which a solvent diffuses from an area of a high concentration through a semi-permeable membrane into an area of low concentration.
    • "Osmosian" also refers to the process by which living cells absorb nutrients; this is a reference to the Osmosians' absorption powers.
  • When their existence was first revealed, the Osmosians were believed to be an alien species native to the planet Osmos V. However, this was retconned in the Omniverse episode "The Rooters of All Evil", which revealed that Osmosians are a human subspecies and that both Osmos V and the sun Osmos were both made up by Servantis.
    • Correlating with this, it was confirmed that the Omnitrix contained Osmosian DNA.[2] This is no longer true, as the Omnitrix cannot accept DNA from mutants (arguably including Osmosians) because they do not count as aliens.[3]
  • The decision to change Osmosians from an alien race into a human subspecies was because the crew wanted them to be more in line with Kevin Levin's portrayal in the original series. Additionally, they did not want every aspect of Ben 10 lore to be derived from aliens.[3]
  • Because of the retcon, the Osmosians are how homages to the Mutants of the Marvel Universe and certain Metahumans of the DC Universe that gained their powers through natural causes.
  • Osmosian genes are recessive.[3]


  1. According to Matt Wayne
  2. 2.0 2.1 2.2 2.3 2.4 According to Dwayne McDuffie
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 According to Derrick J. Wyatt