He is the overall tertiary antagonist of the Dark Army series.
During Operation Resurrection in 1943, Wilhelm originally designed the Tesla gun with his brother, Karl, and they didn't believe it could be improved.
Wilhelm and his brother assisted Wilhelm "Deathshead" Strasse in his mission to create a mechanical army from an ancient artifact known as "The Dark Relic". Wilhelm also designed a new Tesla gun with some energy from the Dark Relic. He is later killed in Deathshead's base.