Guest Stars David Sibley as Pralix David Warwick as Kimus Bruce Purchase as Captain Andrew Robertson as Mr. Fibuli Primi Townsend as Mula Bernard Finch as Mentiad Rosalind Lloyd as Nurse Colin Thomas as Mentiad Uncredited Ray Knight as Mentiad Vi Delmar as Queen Xanxia Derek Suthern as Mentiad Peter Whitaker as Mentiad Jeff Wayne as Mentiad