A portion of the tail of a prehistoric reptile is discovered in Denmark. It regenerates into the entire reptile, which proceeds to destroy buildings and property and generally make a nuisance of itself. It can fly, swim, and walk, and has impenetrable scales, which makes it difficult to kill.

Reptilicus

Egon and the gang are hired to stage a robbery of an antique Chinese vase for an economically challenged baron. Naturally they fooled, which infuriates Egon. The gang tries to get back at the baron by switching the vase with a cheap Hong Kong copy. One attempt is made during the barons hunting party, where Egon ends up being bricked up in the catacombs. In another attempt, the gang has to coordinate breaking through several walls at The Royal Theater in Copenhagen with the "Elverhøj" overture.

The Olsen Gang Sees Red

Genç tamirci Borge Rasmussen, Salling Limanı'nda çalışmakta ve şehrin liman işçilerine başkanlık eden biraz daha yaşlı Marinus Frederiksen ile birlikte yaşamaktadır. Marinus, ailesini kaybetmiş olan Borge'u tek arkadaşı olarak görmekte ve onun aşırı görüşlerinden kolayca etkilenmektedir.