The script held in the Crawford Collection in the AFI Research Collection contains the following character notes (excluding regular characters):
'HUGH ROBINSON (ROBBO): Mid-thirties, professional safecracker, born and bred in Matlock but moved to Sydney after a couple of close brushes with the law. A likeable easy-going rogue with a touch of the blarney.
'BABS TAYLOR: About 40. Robbo's elder sister. Forthright and honest she lives in hope of reforming her brother and looks after his daughter Lisa. (Robbo's marriage broke up a few years previously, for reasons which should become obvious). A rugged, no-nonsense personality with a soft spot for Robbo.
'EARL TAYLOR: About 40. Earl married Babs about five years ago under the false impression that he could induce her to sell the property and thus live off the proceeds. Basically lazy, he has a patent aversion to farm life and suffers periodically from hay fever. (Must Drive)
'FRANK NASH / WES PARKER: Late thirties, early forties. Two heavies working out of Sydney. Tough, ruthless professionals with a score to settle. (One of them must drive)
'LISA ROBINSON: Robbo's fourteen year old daughter. Idolises her father but aware of his short comings [sic]: loves horses. She proves a major stumbling block in her father's plans to escape. (Does not have to ride)
'KEITH HARDING: Fifties. Manager of the Matlock Dairymen's co-op.
'TRUCK DRIVER: Thirties. Small part.
'JIMMY MULLIGAN/CHICKA DEMPSEY: Forties. Drunken pub brawlers.
'DRIVER AT ROADBLOCK: No lines.'
A character has been deleted from the character notes: 'HEATHER GREEN: Twenties. Receptionist at the Regal Motel'.