Siamese twins separated at birth retain a psychic link; each feels the other's pain and happiness.
| Actor | Role |
|---|---|
 Richard GreeneMario / Carlos | Mario / Carlos |
 Paula RaymondChristina | Christina |
 Raymond BurrJonatto | Jonatto |
 Dona DrakeZelda | Zelda |
 Raymond GreenleafPaoli | Paoli |
 Lee Van CleefNerva | Nerva |
 Frank PugliaRiggio | Riggio |
 Nestor PaivaLorenzo | Lorenzo |
 Peter MamakosDiegas | Diegas |
 Paul CavanaghDianza | Dianza |
 Peter BroccoAngelo | Angelo |
 George J. LewisArturo | Arturo |
 Clayton MooreRicardo | Ricardo |
 Virginia BrissacMaria | Maria |
 Francis McDonaldGrisha | Grisha |
 Michael AnsaraBlacksmith | Blacksmith |