For the German dub, Thor was voiced by Christopher Lee. Coincidentally, the films depiction of Odin bears a strong resemblance to his role of Saruman from the Lord of the Rings movies.
With a starting budget of 14,5 million Danish kroner, the project was already the most expensive Danish cartoon. By December 1984, the budget had soared to 22 million kroner, causing turmoil among the production companies.
To create the opening tracking shot a 6 meter wide illustration was painted.
The first big-scale cartoon project in Denmark.
The basis of production of the movie was established by Jakob Stegelmann and animators Jeffrey J. Varab and Jorgen Klubien when they started a Copenhagen animation school in 1981. Later, the studio Varab-Stegelmann Productions was formed, starting production of Valhalla and other projects along with a consortium of other production companies.