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Jarr and his cousin, Tyrr, hailed from the Microverse world known as Bast, where a nuclear war had left their world devastated, with barely any plants, animals, or even people left alive. With the use of a device that could observe other dimensions, Jarr came across Earth, and hoped to siphon off energy from it in order to power reconstruction devices and weapons which would allow him to conquer what was left of his people.


Jarr was created by Mike Friedrich, George Tuska, and Vince Colletta. While he was the one who sent the Super-Adaptoid after Iron Man in Iron Man #49, he did not make an official appearance until the following issue.

Major Story Arcs

There Lurks the Adaptoid!

Iron Man was attacked by the Super-Adaptoid, which had been secretly re-activated by Jarr to serve as his other-dimensional agent. After a harsh battle, Iron Man managed to bury the Adaptoid under a pile of rubble.

The Curtain Rises On... "Deathplay!"

After escaping from the rubble, the Adaptoid found its acquired powers to have vanished, and it ended up evolving from its artificial flesh into a metal-based being, the Cyborg-Sinister,  which was all part of Jarr's plan.

Now Stalks the Cyborg-Sinister!

Under Jarr's command, the Cyborg-Sinister went to Stark Industries in order to find the chemicals necessary to generate an explosion, the energy of which could be channeled back to Jarr's machines in Bast. Iron Man quickly arrived on the scene to stop the Cyborg, and managed to knock it into the chemicals it was planning the use, causing them to eat away at its body.. 
His plan thwarted, Jarr prepared to detonate the Cyborg and kill Iron Man. Not willing to allow his cousin to commit murder, Tyrr tried to stop Jarr. Their ensuing struggle caused Jarr's computer console to explode, disabling the Cyborg and bringing an end to Jarr's plans. 

Powers and Abilities

Jarr was a fairly intelligent and cunning individual who had access to his homeworld's highly advanced technology.

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