Alien Species

Methanosians, also known as Homo Palustris, are a floral sapient species from the swamp planet Methanos.[1]



Methanosians are humanoid plant-like aliens taller than Humans with a red flame-patterned head, root-like feet seemingly holding black rocks, pointed oval-shaped eyes ending with pupils copying the shape but in a smaller size, red and yellow petals on their shoulders and heads, four or five-fingered hands, and green frills sticking out of their elbows and legs.

Before they hit puberty, they have black faces and their petals and facial structure are different. But at the age of 16 Earth years, they slowly blossom in their mature form. However, not all of the Methanosians pass through the blossoming process, Swamps is an example of this.

During their first stage of "blossoming", Methanosians look mostly the same except they become more muscular, the lines on their necks have thinned, and the lines on their chest have moved upward into a pointed-down angle. They lose their pupils, one of their shoulder petals, and one of their leg frills. Their fingers are more claw-like than before.

During the second stage of "blossoming", Methanosians become even more muscular, their red petals form a thorn-like shape, and the lines on their necks become triangular. They lose the lines on their chests, their remaining leg frills, and another of their shoulder petals, yet gain two petals on each forearm and thorns on their feet. Their hands become black and their fingers become two different shades of yellow. Their faces are colored red, yellow, orange, and black. They also have large collars raised up around their necks that are yellow on the inside and the same color as the rest of their skin on the outside.

"Blossomed" Methanosians are even more muscular and taller than before, their faces no longer have black parts over the eyes, their chins are more visible, they gain thorns on their knees and elbows, and their red petals have yellow spots that evoke flames.

Although they traditionally have green skin, Methanosians can come in other colors. For example, Methanosians from Dimension 23 have aqua skin, Negative Swampfire has red skin, Anur-Mirror Swampfire has grey skin, and Benjamin Franklin's Swampfire has yellow skin. The tone of a Methanosian's skin changes as they "blossom".


Methanosians probably absorb nutrients from soil through their feet and use photosynthesis.[2]

Powers and abilities[]

A Methanosian's body produces large amounts of highly flammable methane gas[3] by breaking down rotting plant matter in their stomachs. They then ignite this methane in their palms to generate and blast flames of varying heat and intensity similar to a flamethrower.[1] After "blossoming", they can ignite methane from holes in their palms.

A Methanosian's fire blasts are initially powerful enough to harm Vaxasaurians and Sonorosians. After "blossoming", these fire blasts become more powerful.

Similar to Pyronites, Methanosians are capable of limited flight through means of launching fire from their palms as jet propulsion.

Similar to Florauna, Methanosians are capable of different feats of chlorokinesis,[2] such as telepathically interface with plant life, manipulating biological agriculture of their creation, and sprouting vine-like tentacles from their backs.

After their "blossoming", a Methanosian's chlorokinetic abilities are modified so that they can grow plants by simply raising their hands and control sentient plant life. They can also generate flame-tipped vine-like whips that can slice through the plasma generated by Insectoids.

Methanosians can generate a gas that seemingly mutates plant life, making them elongate, enlarge, and ensnare enemies.

Methanosians can generate seeds from their bodies that phase into or pierce into any surface before turning to vine tentacles strong enough to restrain Atasians and Chimera Sui Generi.

A Methanosian's body can generate a type of mud that sticks to everything but them, which is affective in blinding Vaxasaurians.

Methanosians care capable of regenerating and regrowing any damaged or destroyed body parts, allowing them to grow back lost limbs, holes in their bodies, or even their heads. They are even able to re-grow and reform their body from remains after getting splattered to pieces.[1] Their regeneration can be passed onto other beings such as Atasians.

Mathanosians are capable of reattaching detached or severed body parts[1] by manipulating their vine-like "veins" and tentacles to reach out and meld with the insides of the detached limb and return them to the body, allowing them to reconstitute automatically if damaged.

A Methanosian's methane has a very pungent and swampy stench that is intolerable and repulsive to other beings. For example, the smell makes Incurseans retch and faint.

Using their methane abilities, Methanosians can produce "sleeping spores" that can render Humans unconscious.

Methanosians are strong enough to push down a large Highbreed weather array, resist the gravitational force of a Null Void portal, and fight on-par with a Chimera Sui Generis of Vilgax's power level. Their natural strength increases as they "blossom".

Mathanosians can extend their fingers and feet into long roots that can dig through rock.

Methanosians can jump exceptionally high. They also have strong teeth capable of injuring another Methanosian.

Methanosians are nearly impervious to physical harm[1] and seemingly immune to laser bolts, which feel like tickles to them. Their natural durability can be amplified as they "blossom" so they can take more hits.


Similar to Pyronites, a Methanosian's fire attacks can be canceled by water or fire extinguishers. They are also ineffective against a Chimera Sui Generis or a containment suit worn by a Prypiatosian-B.

Methanosians can be temporarily immobilized by ice, such as a Necrofriggian's ice breath, until they thaw themselves using their fire powers.

Methanosians are vulnerable to electricity, such as a Conductoid's attacks.

Despite their enhanced strength, Methanosians are physically weaker than Crystalsapiens, Tetramands, and Vaxasaurians.[4]

Methanosians can be affected by magic, as such an attack can leave their backs scorched.

Like other organic beings, Methanosians can be aged to dust by the time rays of a Chronosapien or Chronian.

Methanosians can be easily overpowered by a Galilean's gravity powers.

Planets controlled by Methanosians can be killed by certain chemicals.

A Methanosian's body heat can make it difficult for them to fight reptiles and other opponents that are attracted to heat.

Prior to their "blossoming", Methanosians are unable to control sentient plants let alone weeds.

Culture and society[]


Methanosians have stuffy voices because they do not have noses. However, they do possess a sense of smell.

Notable members[]

  • Swampfire: An Omnitrix transformation used by Ben Tennyson
    • Mr. Mucky: An alternate version of Swampfire used by the Ben Tennyson of Dimension 23.[2]
    • Swampfire (Ben 10 Franklin): An alternate version of Swampfire used by the Ben 10 Franklin version of Benjamin Franklin.
    • Negative Swampfire: An alternate version of Swampfire used by Albedo.
    • Anur-Mirrored Swampfire: An alternate version of Swampfire used by a mirror clone of Ben Tennyson.
  • Swamps: A Methanosian actor who played Swampfire in Albedo's stage play.


  • Ultimate Kevin: 17-year-old Kevin Levin of the Prime Timeline transformed into an amalgamation of every alien available in the Ultimatrix prior to traveling to the Forge of Creation, including Swampfire.
  • Reinrassig III: An Atasian whose DNA was repaired when Swampfire reattached his severed hand.
  • Bioids: The Prime Timeline's Vilgax transformed his Bioid army into copies of Swampfire by linking them with the Omnitrix.


Methanosians are descended from carnivorous swamp plants but evolved into plant-like humanoids at some point in their evolution.



  • The name Methanosian is a play on "methane"; it was first used on-screen by Rook Blonko in the Omniverse episode "Charmed, I'm Sure".
    • The alternate name Homo Palustris is derived from the Latin word "palustris", meaning "swampy" or "marshy"; it was first used on-screen by Reinrassig III in the Alien Force episode "Alone Together". However, this taxonomic designation is a bit faulty because they are descended from plants rather than humans.
  • The Sotoraggian SevenSeven is afraid of Methanosians.[4]
  • Methanosian blooming reflects the blooming practices of real-life flowers.
  • Derrick J. Wyatt doubted that Methanosians eat plants, stating that they probably absorb nutrients from soil through their feet and use photosynthesis.
  • The Methanosians' "blossoming" cycle was Derrick J. Wyatt's idea,[2] and the final "blossomed" design was a repurposing of unused concept art made by Tom Perkins.[5]
  • In 2020, Wyatt released a full-color model of an alternate version of Swampfire used by Albedo in Omniverse.
  • It is confirmed that the Omnitrix from the Ben 10 reboot contains Methanosian DNA.[6] Therefore, Swampfire is one of the countless aliens whose DNA pod was glimpsed in the episode "Innervasion Part 5: High Override".
    • Swampfire was among the aliens considered to physically appear in a future season of the reboot. However, changes at WarnerMedia are putting things on pause.[6]


  1. 1.0 1.1 1.2 1.3 1.4 According to Swampfire's bio card from Bandai's Ben 10: Alien Force toyline
  2. 2.0 2.1 2.2 2.3 According to Derrick J. Wyatt
  3. According to the Ben 10: Alien Force production bible
  4. 4.0 4.1 According to Dwayne McDuffie
  5. According to Tom Perkins
  6. 6.0 6.1 According to Duncan Rouleau