Dr. Katic was known as the world's greatest scientist. Having invented the cure for cancer, he was rewarded with a Nobel Price. Although a genius, Dr. Katic lacks the ability to remember properly, often forgetting simple things. However, his forgetfulness backfired when he was fired from the company he was working in. Devastated, Katic researched a cure to help him remember, despite his efforts, Katic had stuffed it up. The cure had caused him to forget things every minute, therefore dubbing himself the Goldfish.
The effect wasn't all bad. Katic gained the ability to cause temporary memory loss to anyone he touches. This wasn't his intention. Everyone treated him like a bad guy, and one final day where he couldn't take the criticism anymore, he became one.