- Writer (The Sand Castle):
- Patrick Barrington
- Designer/Puppets created and animated by (The Sand Castle):
- Sam Williams
- From an idea by (The Sand Castle):
- Kim Taylor
- Music composed and played by (The Sand Castle):
- James Turner
- Puppets created and animated by (The Sand Castle):
- Elisabeth Williams
- Puppets created and animated by (The Sand Castle):
- Jennifer Hughes
- Additional animator (The Sand Castle):
- John Vinden
- Producer (The Sand Castle):
- Pamela Brown
- Presenter (Workshop):
- W.P. Matthew
- Writer (Into Thin Air):
- Peter Ling
- Producer (Into Thin Air):
- Michael Westmore
- Himself:
- Robert Harbin
- Jill:
- Margaret McCourt
- John:
- Anthony Green
- Narrator/Neptune:
- Ivan Staff
- Bert:
- Kenneth Connor
- Kate:
- Helen Stirling
- Dr. Yorke:
- Richard Baldwyn
- Allen:
- Geoffrey Hibbert
- Keith:
- Gawn Granger
- Roger:
- Barry MacGregor
