James Whitmore

as Mark Twain (voice)

Michele Mariana

as Becky Thatcher / The Mysterious Stranger / Girl in Crowd (voice)

Gary Krug

as Huck Finn (voice)

Chris Ritchie

as Tom Sawyer (voice)

John Morrison

as Adam (voice)

Carol Edelman

as Eve (voice)

Dal McKennon

as Jim Smiley / Newspaper Boy (voice)

Herb Smith

as The Stranger (voice)

Marley Stone

as Aunt Polly (voice)

Wilbur Vincent

as The Mysterious Stranger (voice)

Wally Newman

as Captain Stormfield (voice)

Tim Conner

as Three-Headed Alien / Mud People (voice)

Todd Tolces

as Saint Peter (voice)

Billy Scream

as The Indexivator / Animal (voice)

Bob Griggs

as First Heckler (voice)

Coward Wholesale

as Second Heckler (voice)

Tom Gasek

as Homer / Man in Crowd / Calaveras Miner / Mud People (voice)

Sally Sopwith

as Woman in Crowd (voice)

Will Vinton

as Dan'l Webster (voice)

Andrew Edwards

as First Miner (voice)

Harvey Brown

as Second Miner (voice)

Craig Bartlett

as Calaveras Miner (voice)

Mark Gustafson

as Calaveras Miner (voice)

Bruce McKean

as Calaveras Miner (voice)

Billy Victor

as God (voice)

Compton Downs

as Injun Joe (voice)

Nell Suza

as Animal / Mud People (voice)

Tim Kahn

as Animal (voice)

Stashu Beencof

as Animal (voice)

Gary Thompson

as Baby Cain (voice)