Guy Madison has a high old time as a would be feudal baron in the Wild West. No one is willing to stand up to Madison and his henchmen, no one that is, except mild-mannered inventor Tom Bosley. It seems that Bosley has welded together a robot gunslinger, whom he calls "The Bang Bang Kid". Only trouble is, the "Kid" breaks down at the darnedest times.
| Actor | Role |
|---|---|
 Guy MadisonBear Bullock | Bear Bullock |
 Tom BosleyMeriwether P. Newberry | Meriwether P. Newberry |
 Sandra MiloGwenda Skaggel | Gwenda Skaggel |
 Riccardo GarroneKiller Kossock | Killer Kossock |
 José María CaffarelMayor Skaggel | Mayor Skaggel |
 Dyanik ZurakowskaBetsy Skaggel | Betsy Skaggel |
 Luciano BonanniThe barber | The barber |
 Eugenio GaladiniOld Man | Old Man |
 Giustino DuranoHotchkiss | Hotchkiss |
| RRenato ChiantoniHotel Clerk | Hotel Clerk |
 Nazzareno NataleLeather Worker | Leather Worker |
 Pino FerraraSheriff Jake | Sheriff Jake |
 Ennio AntonelliCouncilman | Councilman |
 Mimmo PoliBartender | Bartender |
| MMario DanieliNot listed | Not listed |
| JJeanine NardellNot listed | Not listed |
| BBen TatarLeech | Leech |
| FFederico BoidoSixfingers Sykes (uncredited) | Sixfingers Sykes (uncredited) |
 Umberto RahoRev. Garrett Emerson Langry (uncredited) | Rev. Garrett Emerson Langry (uncredited) |