"Ex-police/army dog King inherits a fortune from an eccentric millionaire. But someone poisons him for his fortune. He gets to go back to earth as a human detective to bring his killer to justice and protect the girl who used to look after him."
Dick Powell
as Rex Shepherd
Peggy Dow
as Ellen Hathaway
Joyce Holden
as Goldie Harvey
Charles Drake
as Perry Collins
Albert Sharpe
as Grandpa Hathaway
Lou Polan
as Sergeant Novak
Frank Nelson
as Lieutenant Gilpin
William Vedder
as Nicholas
Frank Gerstle
as Detective
Anthony George
as Louie Luisetti
Tom Dugan
as Bus Driver (uncredited)
Henry Kulky
as Gorilla / Prisoner (uncredited)
Olan Soule
as Dog House Salesman (uncredited)
Elsie Baker
as (uncredited)
Tony Barr
as Jail Inmate (uncredited)
Richard Bartell
as Waiter (uncredited)
Genevieve Bell
as Dowager (uncredited)
Margaret Bert
as Factory Worker (uncredited)
Chet Brandenburg
as Man on Street (uncredited)
Ralph Brooks
as Man in Bar (uncredited)
Paul Bryar
as Prisoner (uncredited)
Juanita Close
Russ Conway
as Cop (uncredited)
Jack Daly
Steve Darrell
as Idylwild Kennel Man (uncredited)
Watson Downs
as Slott, Dog House Salesman (uncredited)
Roy Engel
as Police Turnkey (uncredited)
Flame
as King (uncredited)
Jack Gargan
as Smitty - Wiretapper Detective (uncredited)
Mack Gray
as Prisoner in Jail (uncredited)
Kit Guard
as Squint Eye (uncredited)
Joy Hallward
Larry Johns
Freeman Lusk
as Major Smith - Kennel Operator (uncredited)
Alan Marston
William J. O'Brien
as Andrew Lindsay (uncredited)
Steve Pendleton
as Motor Cop (uncredited)
Les Raymaster
Jack Reynolds
as Cab Driver (uncredited)
Ted Stanhope
as Headwaiter (uncredited)
Clarence Straight
as Vic - a Cop (uncredited)
Charles Sullivan
Sara Taft
as Mrs. Bowers (uncredited)
Lou Breslow
Director
David Chandler
Screenplay
Story
Maury Gertsman
Director of Photography
Russell A. Gausman
Set Decoration
Bud Westmore
Makeup Artist
Alexander Golitzen
Art Direction
Leslie I. Carey
Sound
Frank Gross
Editor
Leonard Goldstein
Producer
Ruby R. Levitt
Richard DeWeese
David S. Horsley
Special Effects
Bill Thomas
Costume Design
Joan St. Oegger
Hairstylist
Bernard Herzbrun
Hans J. Salter
Original Music Composer