As a scientist working for the Kingpin, Dr. Jonathan Ohnn was assigned to reproduce the radiation levels of Cloak to find a way to artificially mimic his powers. Working late one night, he succeeded, creating a solid black circular portal. In doing so, however, the drain on the city's power became so great, a blackout washed over the city, causing the portal to shimmer and destabilize. Fearful of losing a once in a lifetime opportunity, Ohnn stepped into it; the shock of the transition caused him to pass out. He awoke floating weightlessly in a dimension which he initially assumed was Cloak's dark dimension. He soon realized however that the power shortage caused the portal to send him to a different dimension, a place of half darkness and half light. A seemingly infinite number of portals surrounded him in this place. Making swimming motions, he managed to find the original portal that brought him there and slipped back through it. When Ohnn emerged back in his lab, his body had undergone a radical transformation. The portals from the other dimension had adhered to his skin, covering him with black spots from head to toe. Realizing the spots were portable space warps, he started to think he might be able to use them to defeat anyone in battle. When Spider-Man and the Black Cat arrived to confront the Kingpin, he appeared before them and announced himself as the Spot. Spider-Man collapsed on the roof, laughing at the name. The Spot ended up winning that first confrontation and warned the heroes to leave the Kingpin alone. He later lost a second battle against Spider-Man because he was tricked into throwing too many of his spots as weapons and not keeping enough to defend himself with.