- Country: USA
- Genres: Animation, Short
- Release: 1943-07-30
- Director: Seymour Kneitel , Dave Fleischer , Steve Muffati
- Writers: Jerry Siegel , Joe Shuster , Carl Meyer
- Language: English | German
- Stars: Joan Alexander , Joan Alexander , Jackson Beck , Jackson Beck , Jackson Beck , Jackson Beck , Jackson Beck , Jackson Beck , Jack Mercer , Jack Mercer , Julian Noa , Julian Noa , Julian Noa , Julian Noa , Julian Noa , Julian Noa , Sam Parker , Sam Parker , Lee Royce , Lee Royce
- Runtime: 8 min
- Awards: N/A
- AKA: Agente Secreto (Brazil) , Salainen agentti (Finland) , Under the River (United States of America) , Agente secreto (Argentina) , Secret Agent , Секретный агент , Secret Agent (United States of America)
- Plot: Clark Kent helps a pretty blonde Federal agent escape a gang of Nazi saboteurs, and lets himself be captured to learn their plans. The blonde, pursued again, falls into the gears of a drawbridge...
- IMDB:tt0036336
Secret Agent Cast · · · ALL
Joan Alexander
Secret Agent (voice) (uncredited)
Jackson Beck
Narrator / Police Chief / Saboteur (voice) (uncredited)
Bud Collyer
Clark Kent / Superman / Saboteur (voice) (uncredited)
Jack Mercer
Perry White / Saboteur (voice) (uncredited)
Julian Noa
Perry White / Police Officer / Saboteur (voice) (uncredited)
Sam Parker
(voice) (uncredited)