Gustave – Primeval
This one is a bit of a cheat, since Gustave isn’t actually a serial killer, but that didn’t stop Primeval’s promotional materials from touting him as “the most prolific serial killer in history.” Gustave is a 20-foot-long crocodile in Burundi that has supposedly killed as many as 300 people since the 1990s. He is feared by many people in the region and still alive today.
