Capt. Cyrus Harding
Jack Pencroft
Rulu of Mercury
Herbert 'Bert' Brown
Pirate Capt. Shard
Gideon Spillett
Capt. Nemo
Ayrton - The Wild Man
Moley - Shard Henchman
Neb (as Bernard Hamilton)
Mr. Jackson
Mercurian
Confederate Officer (uncredited)
Thug in Park (uncredited)
Pirate (uncredited)
Narrator (voice) (uncredited)
Mercurian (uncredited)
Union Dispatch Rider (uncredited)