Annette Kellerman
Annette, Neptune's daughter
William E. Shay
King William
William Welsh
King Neptune (as William Welch)
Leah Baird
Princess Olga
Mrs. Herbert Brenon
Roador the Wolf
Edmund Mortimer
Duke Boris
Lewis Hooper
Count Rudolph
Mrs. Allen Walker
The Sea Witch
Millie Liston
Jailer's Mother
Katherine Lee
Princess Olga as a Child
Edward Boring
The Old Man of the Sea