- Tommy Gilligan as William
- Numbuh 5 as Lars The Little Polar Bear
- John Alderton - Numbuh 1
- Carlo Bonomi - Numbuh 4
- Andrew Sachs - Tommy Gilligan
- Susan Sheridan - Numbuh 362 and Numbuh 5
FireKids Next Door Operative Nigel
Tommy's Wish American Boots
Rachel MacKenzie's Pennsylvania Adventures
- Rachel MacKenzie and The Special Key
The Little African-American Kids Next Door Operative
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