Primus appears as a Jungle-like planet, full of vegetation and various unintelligent alien life forms, some of them dangerous. The main creatures on this planet are Voliticus Biopsis, mosquito/wasp-like, robots created by Azmuth who travel the Universe in order to find new alien DNA to add to the Codon Stream. The planet seems to have a mind of its own, as it was able to call Azmuth when Vilgax arrived.
The main element of Primus is the Codon Stream, a green liquid substance present throughout all the planet. It actually serves as the database for the Prototype Omnitrix/Ultimatrix, containing all the DNA the Voliticus Biopsis found in the Milky Way Galaxy. The Prototype Omnitrix/Ultimatrix communicates with this database, which gives it the information necessary to modify Ben's genetic code and allow him to transform into 1,000,910 different alien lifeforms.
Because of the Prototype Omnitrix's destruction, the Ultimatrix was the only device able to have contact with the planet and the collected DNA.
- According to Derrick Wyatt, Primus and the Codon Stream has been erased from continuity due to the Universe being destroyed due the Anihilaarg.
- The Omnitrix is no longer connected to Primus and has the DNA stored within itself in a computerized form.