The Mystery of the Cliffs was a 1992 VHS video commissioned by the United States Bureau of Land Management. It was intended to introduce children to the concept and importance of caretaking of the country's natural resources and heritage sites. All the voice actors from the 1987 series reprise their roles for this video.
Cast

Barry Gordon
Donatello (voice)

Cameron Clarke
Leonardo (voice)

Townsend Coleman
Michaelangelo (voice)

Rob Paulsen
Raphael (voice)

Peter Renaday
Splinter / Splinter's Ancestor (voice)
Mark Barrett
Michelangelo
Danyol Leon
Donatello
Laura Kotecki
Leonardo
Danielle Silveira
Raphael
David Anthony
Splinter / Splinter's Ancestor
Scott Quintard
Foot No. 1
James Saba
Foot No. 2
Michael Carpio
Foot No. 3
Crew
Jacques Guerin
Director
Francine Panzo
Editor
Rebecca Bisgyer
Production Coordinator
Joseph Guerin
Producer
Ashley Quinn
Associate Producer
James Saba
Production Assistant
Laurie Stevens
Production Assistant, Craft Service
Brian Pratt
Camera Operator
Bill Harrison
Camera Operator
Steve Bannister
Assistant Camera
Paul Cases
Aerial Camera
Richard A. Lopez
Aerial Camera
Laura Ortiz
Post Production Coordinator
Tenia Lednicky
Wardrobe Supervisor
Albert Valdez
Assistant Art Director
Mike Wilson
Sound Assistant
Russ Simon
Sound Recordist
Russell Macaby
Boom Operator
Tom Feldman
Lighting Director
Scott Gale
Music Director
Paul Godwin
Painter
Bernard Tansey
Props
Kevin Royan
Props
Sharon Means
Props
David Guilbert
Still Photographer
Kimberly Fenkner
Script Supervisor
Saul Cohen
Best Boy Electric
Cal Simmons
Travel Coordinator
Jerry Harper
Best Boy Grip
Deb Adair
Recording Supervision
Paul Gofberg
Recording Supervision
Jeff Messenger
Video Assist Operator
Elliot Nachbar
Key Grip
John Salzman
Grip
Allan Fulford
Grip
Les Wells
Unit Production Manager
Ginette Guerin
Production Secretary
Julie Caron
Graphic Designer