What actors and actresses appeared in Castle Dangerous - 1958?

It seems you are referring to the film "The Vikings" (1958), not "Castle Dangerous".

Here are the main actors and actresses in "The Vikings":

* Kirk Douglas as Einar

* Tony Curtis as Eric the Red

* Janet Leigh as Helga

* Ernest Borgnine as Ragnar

* Alexander Scourby as King Horik

* James Donald as Leif Eriksson

* Eileen Ryan as Thora

* Russ Tamblyn as Olaf

* Brian Aherne as Askeladd

Let me know if you have any other questions!