A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome saboteur Sakima.
| Actor | Role |
|---|---|
| TTom SteeleThe Masked Marvel | The Masked Marvel |
 Louise CurrieAlice Hamilton | Alice Hamilton |
 Johnny ArthurMura Sakima | Mura Sakima |
 William ForrestMartin Crane | Martin Crane |
 Anthony Warde'Killer' Mace | 'Killer' Mace |
| RRod BaconJim Arnold | Jim Arnold |
 Richard ClarkeFrank Jeffers | Frank Jeffers |
| DDavid BaconBob Barton | Bob Barton |
| BBill HealyTerry Morton | Terry Morton |
 Howard HickmanWarren Hamilton | Warren Hamilton |
 Eddie ParkerMeggs | Meggs |
 Kenneth HarlanGas Works Policeman | Gas Works Policeman |
| TThomas LoudenMatthews | Matthews |
| DDuke GreenCarl - Delivery-Truck Thug / Spike - Gas works saboteur / Kaler - Roof-top thug | Carl - Delivery-Truck Thug / Spike - Gas works saboteur / Kaler - Roof-top thug |
 Dale Van SickelTall Gas-Works Saboteur / Station-Wagon Thug / Super-X Warehouse Thug #1 | Tall Gas-Works Saboteur / Station-Wagon Thug / Super-X Warehouse Thug #1 |
 Wendell NilesNewscaster | Newscaster |
 Lester DorrReporter #1 | Reporter #1 |