A former psychologist, Gross was ruined when several of his students, who he admitted to doing "sick things" to, turned him in. Gross used an abandoned construction site as his lair, and took revenge on the students who ruined him, slowly torturing them to death while psychoanalyzing them. Gross was eventually arrested and placed in trial, and sent to jail. While imprisoned he began a bizarre self-analyzation which ultimately led to him skinning himself in order to come closer to his "true self". Gross was removed from prison, and taken to a psychiatric hospital where he escaped. He then set about murdering a number of his other students, often convincing them to commit suicide or skin themselves.
In order to find Gross, Cassie, equipped with a tracking device so Vlad could find her, allowed herself to be captured by Gross, who tied her to a chair in his hideout, and tortured her by beating her and cutting off two of her toes with a motorized saw. While torturing Cassie, Gross forced her to relive past memories, including being tormented by bullies, her mother's suicide, meeting Vlad, and the day her father left. Seemingly growing bored after diagnosing Cassie with antisocial personality disorder, and pointing out her issues with her father, Gross deems her "untreatable" and prepares to slit her throat when Vlad leaps through the window behind him and cuts one of Gross's arms off. After being untied by Vlad, Cassie simply states "Ya wanna know the truth about me, doc? I'm really fucked up" before shoving Gross out a nearby window and onto a pile of cinder blocks, killing him