Alexander was sent by De Groot to deal with the Grausen case in Portland reported by Rosalee Calvert. Once he arrived, he was prevented from killing the infected child, Daniel Keary by Nick Burkhardt. Before he left Portland Nick gave him the medical report on Grausen after Daniel was cured. The report showed that Grausen was an parasitic infection that could be cured by causing the sufferer to experience hypothermia.
When they woge, Pflichttreue gain glowing yellow-green eyes, sharp teeth, and dull white fur grows all over their bodies which has black spots. Pflichttreue are weaker than Grimms as Nick was able to take Alexander down without much of a fight. However, Pflichttreue are quick and stealthy, able to appear and disappear without a trace.
Pflichttreue are smart, fearless, and extremely loyal. Because of these traits, several are used by the Wesen Council to help with some of their most difficult dirty work.