Van Johnson

as Pied Piper / Truson

Claude Rains

as Mayor of Hamelin

Lori Nelson

as Mara

Jim Backus

as King's Emissary

Kay Starr

as John's Mother

Joseph Sargent

Doodles Weaver

as First Counselor (uncredited)

Stanley Adams

as Second Counselor (uncredited)

Oliver Blake

as Leading Citizen (uncredited)

Rene Kroper

as Paul (uncredited)

William H. O'Brien

as Townsman (uncredited)

Carl Benton Reid

as Mayor of Hamelout (uncredited)

Amzie Strickland

as Leading Townswoman (uncredited)

Judith Woodbury

as Townswoman (uncredited)

Cyril Delevanti

James Gonzalez

as Citizen

Jess Kirkpatrick