The Secret of Convincing John

Gerard Parkes

Doc

Jerry Nelson

Gobo Fraggle / Marjory the Trash Heap / Pa Gorg / Uncle Gobo Fraggle / Mervin Merggle / Fishface / Parrot / Architect Doozer / Feenie Fraggle / Radio Announcers (voice)

Steve Whitmire

Wembley Fraggle / Sprocket the Dog / Mermer Merggle / Crusty Doozer / Venerable Sage Hambo / Murray the Minstrel / Flange Doozer / Sir Blunderbrain / Club Member #3 (voice)

Karen Prell

Red Fraggle / Balsam the Minstrel / Wingnut Doozer / Judge Gaval Fraggle / Marly Fraggle / Gorg's Killer Souffle / Wingnut Fraggle / Fluffinella / Modem Doozer / The Beast / Baby Tree Creature (voice)

Dave Goelz

Boober / Uncle "Traveling" Matt / Side Bottom / The World's Oldest Fraggle (voice)

Kathryn Mullen

Mokey Fraggle / Cotterpin Dozer / Crosscut Doozer / Merboo Merggle / Rock Hockey Hannah / Wimple Fraggle / The Old Gypsy Lady / Sally Spotless / Tammy Shrub / Baby Doozer / Doozer #2 (voice)

Bob Stutt

Muppet Performer / Felix the Fearless / Wandering McMooch / Last of the Lily Creatures / The Avalanche Monster / Bigmouth Fraggle (voice)

Richard Hunt

Junior Gorg (himself) / Gunge / Mudwell the Mudbunny / Herkimer Fraggle / The Spiderfly / Gillis Fraggle / Turbo / The Genie / Purple Fragglette / Fire Chief Fraggle / Flex Doozer / Background Fraggles (voice)

Jim Henson

Convincing John (voice)