Richard Crane
Capt. Cyrus Harding

Marshall Reed
Jack Pencroft

Karen Randle
Rulu of Mercury

Ralph Hodges
Herbert 'Bert' Brown

Gene Roth
Pirate Capt. Shard

Hugh Prosser
Gideon Spillet

Leonard Penn
Capt. Nemo

Terry Frost
Ayrton - The Wild Man

Rusty Wescoatt
Moley - Shard Henchman

Bernie Hamilton
Neb

William Fawcett
Mr. Jackson

George Robotham
Mercurian

Stanley Blystone
Confederate Officer

Roy Butler
Thug in Park

Frank Ellis
Pirate

Knox Manning
Narrator (voice)

Zon Murray
Thug in Park

Frank O'Connor
Confederate Officer

Sid Ross
Mercurian

Tom Tyler
Union Dispatch Rider