Aptom is a member of the Lost Unit, a group of Zoanoids that have superior powers but are not mass producible. He originally starts out as a foe of the Guyvers but later becomes an ally after he begins preying on other Zoanoids.
Aptom was a member of the Lost Unit, Zoanoids that have great powers but can not be replicated. The Lost Unit was stationed at Relic Point in Japan and came into contact with Guyver I and an unknown individual. Aptom used his ability to shape shift into anything to become a Guyver like entity. His powers however were not on the same level as a Guyver Armor. During the encounter Aptom's teammates were killed and he swore revenge on Sho for their deaths.
Upon re-engineering, Aptom faced off against Guyver I again. He stalked the Sho Fukamachi and Mizuki Sagawa while they were separted from their party, killing several teams of Zoanoids in the process (disguised as Guyver III) until he had the pair where he wanted them. Aptom demanded Sho bio-boost but the young man was not able to. Aptom then told Sho that he was repressing the armor due to his unintentional murder of his father. Seeing Mizuki in harm, Sho managed to finally bio-boost. Aptom showed off his ability to mimic various Zoanoids and them took his second form consisting of a mixture of Zoanoids Gregole, Vamore and Enzyme II. He injured the Guyver's hands but was unprepared for Sho being able to remotely open his chestplate to access the Mega Smasher. Aptom was almost entirely vaporized save for his right arm.
After his second defeat at the hands of Guyver I, Aptom re-evaluated his strategy. When the Hyper Zoanoid Team Five came investigating the unknown Zoanoid (Aptom's second form) he absorbed Elegen. Explaining to the Zoalord in charge that he was now immune to their psionic abilies, Aptom made his intention to absorb the rest of the team clear. He absorbed all the living member of Team 5 merging into an extremely powerful zoanoid. Zx-tole however managed to escape complete absorption by blowing off his leg and fleeing.
A year after the Relic Point incident, Aptom is protecting the Sagawa's and their friends from Chronos. He is later found by Zx-tole who has been re-engineered as a lost number. Containing amplified version of his teammates powers as well as anti-bodies that protect him from Aptom, Zx-tole destroys most of Aptom's body before his encounters Guyver III and then finally the Gigantic Guyver. Zx-Tole is no match for the Gigantic unit and uses his final blast to try and destroy Japan only to have the attack thwarted by the Giga-Smasher blast from the Gigantic Guyver. Aptom absorbs a Zoanoid scout and leaves promising to be in touch.
Originally Aptom had the ability transform into any one thing. He became a Guyver-like being but his abilities were not as strong as a Guyver's. After re-enginering, Aptom was able to copy any Zoanoid he wished (or Guyver) and could match them in power. When he faced off against Guyver I again he retained the characteristics of all three Zoanoids that he had displayed but again underestimated his opponent and his abilities. A side affect of his re-enginering eliminated the ability for a Zoalord to communicate or control him. His regenerative abilities are so great that as long as a single part of him remains he can regenerate. He can accelerate the process by absorbing Zoanoids or Hyper Zoanoids. He attempted to absorb a Zoalord but the lord was too powerful and almost destroyed him entirely. Aptom was then labeled and enemy of Chronos. After Chronos takes over the world, they create Anti-bodies for all their advanced Zoanoids to keep Aptom from absorbing them and gaining their characteristics.
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