X + YY: Formel des Bösen
- Blwyddyn: 1970
- Gwlad: Germany
- Genre: Crime, Thriller
- Stiwdio: Brünnstein-Film
- Allweddair: exploitation, playboy, serial killer, hormones
- Cyfarwyddwr: Teja Piegeler, Pavle Jovic
- Cast: Ljubiša Samardžić, Kai Fischer, Miloje 'Mića' Orlović, Albert Hehn, Leonina Pavlović, Stefan Zessner
