Little is known about Jura, save that he was a Czech youth somehow acquired by the evil Helena Carlson's DermaFree Corporation as an unwilling test subject and taken to the company's secret laboratory in Austria. At some point he escaped, running into a nearby tailor's shop for help, but Carlson's men hunted him down and recaptured him, though not before he scrawled "DermaFree" into the shop's floor with his powers as a message to anyone willing to help.

In the lab, Jura and the other test subjects were kept sedated by the telepathic powers of another guinea pig, Sasha, and potentially-lethal tests performed on them in an attempt to discover cures for skin conditions. They were eventually freed by the shapeshifting spy Mystique, who had been sent by Professor X to infiltrate DermaFree and rescue any mutant test subjects. When cornered by armed guards, Jura used his powers to create a hole in the wall through which the group escaped.

Mystique put the mutants up in a hotel, but, enraged over DermaFree's acquisition of her own genetic material, neglected to keep watch over them, and they were recaptured again. Carlson gave the order to march them back to the lab and execute them, with graves being prepared for them ahead of time. However, the mutants overwhelmed the guards, with one of them reporting to Carlson that they had been killed. Following this, the group was reunited with Mystique.

In the aftermath, Jura and the other mutants led Interpol investigators to the room in the lab where they had been held captive, which DermaFree had repainted overnight into a daycare center. However, Jura used his powers to burn away the paint, and many DermaFree personnel, including Carlson's personal assistant, were arrested. Carlson herself escaped charges due to lack of evidence, but the resulting scandal ensured DermaFree would never test on mutants again and may have even sent them on the road to bankruptcy.


Jura was able to secrete from his pores at will a powerful acidic substance that could burn through solid concrete.

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