Kasimir is one of the three brothers Räuber who were the most powerful criminals in Twinbrook. However, despite being the smartest of their group, Kasimir was always looked down by his brothers for his love for plants. When the three brothers had to flee eventually, Kasimir was the only one who escaped the police. He fled to Sunset Valley, where he met the infamous hacker Mast3rm1nd Z3r0 who was currently looking for new recruits for his dissolved hacker team Cerberus as his two former partners left. Kasimir, seeing a chance for regain his old power, took the offer, being good with computers despite his love for nature. He greatly enjoys his work with Mast3rm1nd as they both share the same intellect. Later, when Virus Masterson, a hacker working under the guise of being an artist, joined them, they were finally able to join forces as the new version of Cerberus.