The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'JOHN CRAIG. Late 20's. Loves his wife and sick child dearly and does everything for them. Outside of this he's capable of extremes of violence.
'PAULINE CRAIG. Mid 20's. Mother of a sick child - the worry and anxiety of caring for the child has taken its toll on her.
'DAVID PRIOR. Mid to late 20's. Owns his service station. Country okker type but with a fairly keen mind.
'BRIGITTE SOLERNO. Rather attractive 20 year old of Italian descent. Expressive face and eyes. (A vague resemblance to Pauline Craig would assist).
'GORDON BISHOP. Early 20's. A nomad and seasonal worker. Has dreams of making his fortune at the casino gambling tables. A fairly harmless type really.
'TOM MITCHELL. Late 60's - though there is no written dialogue for this character the actor engaged for the part should be skilled enough to impress upon the audience through mime that he is a tight fisted one eyed religious fanatic who has condemned the entire world outside of his own small sect.
'ALICE MITCHELL. 60's. Tom's wife. Homely type who through belonging to the same church as her husband, does not share his fanatacism. Must also be a skilled actress.
'STEVEN HOLMES. Around twelve. Freckle faced kid. Under the silt of an inner suburban upbringing. He's a pretty good kid but is still fast to make a quid.
'VARGUS. 30's. Dark swarthy latin [sic] type though Australian born. Bit of a creep, bends the law a little.
'GREG WATKINS. Established.
'PATHOLOGIST. Mid to late 30's.
'PHOTOGRAPHER. Eager beaver. Good nose for a story.
'BALLISTICS MAN. Actual.
'TASSIE UNIFORMED MAN. Actual.
'CRAIG'S NEXT DOOR NEIGHBOUR. Housewife.
'PREGNANT WOMAN. (DAVE PRIOR'S WIFE) Early 20's; no lines - in advanced state of pregnancy.
'TWO AMBULANCE MEN: Actual.
'TASSIE MOTOR CYCLE COP. Actual.
'TWO TASSIE C.I. MEN. Actual.