International spy Jason Starr disappears following an altercation while on a mission. His boss seeks out Jason's twin brother, veterinarian Warren Starbinder, and asks him to pose as Jason in order to complete his mission.
| Actor | Role |
|---|---|
 Michael McKeanJason Starr / Warren Starbinder | Jason Starr / Warren Starbinder |
| BBig John StuddIgor | Igor |
 Alexa HamiltonGerlinde Krueger | Gerlinde Krueger |
 Susan WaldenSharon Starbinder | Sharon Starbinder |
| CChristopher BurtonRuss Starbinder | Russ Starbinder |
 Judith JonesMeredith Starbinder | Meredith Starbinder |
 Lloyd BochnerSpecial Agent Vaughn | Special Agent Vaughn |
 Del ZamoraWillie | Willie |
 Jane A. JohnstonHarriet | Harriet |
| MMarguerite DeLainJune | June |
 Lois JanuaryDowager | Dowager |
 Allan KolmanVlado | Vlado |
 Savely KramarovYurgi | Yurgi |
| PPatrick O'BrienEddy | Eddy |
 John PutchAbercrombie | Abercrombie |
 Jean-Paul VignonMaitre d' | Maitre d' |