Changes from the Book
The part of Philippulus the Prophet is severely reduced. He is seen at the start of the episode when Tintin reaches the observatory and when Tintin is having a nightmare. These appearances were reduced and others, such as Philippulus' "occupation" of the Aurora's crow's nest, are completely missing. The Aurora's fuel stop in Akureyri, Iceland was likewise left out.
- Colin O'Meara - Tintin, Aurora radio operator
- Susan Roman - Snowy
- David Fox - Captain Haddock
- Peter Meech - Radio Announcer