Episode #1.1: Directed by Eivind Aaeng. With Lars Mjøen, Knut Lystad, Trond Kirkvaag, Helge Reiss. Three brothers set out to learn the truth behind the disappearance of a long-lost explorer. In so doing, they have to mount an expedition of their own up the river Overfloden, which is itself shrouded in mystery.

Watch “Brødrene Dal og professor Drøvels hemmelighet” Episode #1.1 (TV Episode 1979)