All sources seem agreed that he was born on July 17th 1932 in Pistoya, Italy.
His earliest confirmed role comes from 1954. From the late 50's to the mid-60's he was fairly busy as a stuntman and master of arms in peplums, working his way up to small character roles. He changed career direction in 1967 to become a director and screenwriter and he would direct and write 6 films over the next 6 years, 5 of which he also appeared in. He doesn't seem to have appeared in any other films during these years, but in 1976-77 he returned to the screen for 2 final appearances in westerns as actor/stuntman, before disappearing off the radar.
He died in Rome on June 23rd 2007 (some sources say July 19th) of an acute myocardial infarction.
I have found several undocumented appearances by Alfio, so there could well be more.
- Ulisse .... Suitor of Penelope (uncredited)
1955 - Il principe dalla maschera rossa .... Alfio (credited)
1959 - Annibale .... Wrestler (uncredited)
- Ben-Hur .... Pirate (uncredited)
- La scimitarra del saraceno .... Pirate (uncredited)
1960 - Cartagine in fiamme .... Ship crewman (uncredited)
- La strada dei giganti .... Bouncer (credited)
- Messalina Venere imperatrice .... Wrestler (credited)
1961 - Barabba .... Gladiator trainer (uncredited)
- Il colosso di Rodi .... Creonte (credited as "Alf Randal")
1962 - Arrivano i titani .... Titan (uncredited)
- El hijo del capitán Blood .... Second challenger on the dock (uncredited)
- Maciste, il gladiatore più forte del mondo .... Physio (credited)
1963 - Il mistero del tempio indiano .... The Crie (credited)
- Il segno di Zorro .... Guard in the mines (uncredited)
- Io Semiramide .... Zagros (uncredited as actor)
- Kali Yug, la dea della vendetta .... The Crie (credit unknown)
- Maciste, l'eroe più grande del mondo .... Meneos (credited)
1964 - Gli schiavi più forti del mondo .... Rebel slave (credited)
- La vendetta di Spartacus .... Muzio (credited)
1965 - Erik il vichingo .... Blonde viking / The bad Indian (credited)
- I due sergenti del generale Custer .... Nervous Buffalo (credited)
- Sette contro tutti .... Vadius (credited as "Al Northon")
1966 - 2+5 Missione Hydra .... Artie (credited)
- L'armata Brancaleone .... Arnolfo Mano-di-ferro (credited)
1967 - Ballata per un pistolero .... El Bedoja (credited as "Al Northon")
1968 - Comandamenti per un gangster .... Frank Cline (poster credit as "Al Northon" - role unconfirmed)
1970 - Una spada per Brando .... The Count (credited)
1972 - Così sia .... Reverend 'Ladrone' Smith (credited as "Alf Thunder")
1973 - Tutti figli di Mammasantissima .... Bug Morano (credited as "Alf Thunder")
1976 - Keoma .... Clay (credited)
1977 - California .... Whittaker accomplice (credited)
- Capitan Fantasma (1953) IMDb for stunts. I didn't recognise him. I will be making a topic for this film sooner or later, so will continue the search then.
- La battaglia di Maratona (1959) IMDb for stunts. He is not identifiable in the poor quality copies currently available, but he may be found hidden under a barbarian wig if a better quality print should appear.
- Oremus, Alleluia e Così Sia (1973) IMDb as Reverend Smith
- Gli ultimi giorni di Pompei (1959) IMDb has him listed as both Master of arms and for stunts. He is not credited for either and if he does appear he is not identifiable. There is no master of arms credited, so it is quite possible he did perform this function, but with no credit or on-set images there is no way to confirm this.
- La rivolta degli schiavi (1960) IMDb for stunts. If he does appear he is not identifiable.
- Colorado Charlie (1965) IMDb as Creonte, credited as "Alf Randal". These are Alfio's role and pseudonym from Il colosso di Rodi, there is no such credit in this film and he does not appear, so it's your typical IMDb f**k up.
- 5 figli di cane (1969) IMDb as Player, whatever that means. He is credited for direction and screenplay, but not as actor and I didn't find him appearing anywhere in the film.
- Maciste, il gladiatore più forte del mondo .... credited as Master of arms as "Alfio Caltabiani"
1963 - Io Semiramide .... credited as Master of arms
1964 - Gli schiavi più forti del mondo .... credited as Master of arms
- Maciste, gladiatore di Sparta .... credited as Master of arms
1965 - Sette contro tutti .... credited as Master of arms
1966 - L'armata Brancaleone .... credited as Master of arms
- Mark Donen - Agente Zeta 7 .... credited for Pyrotechnics and fight arrangement
1967 - Ballata per un pistolero .... credited as Director and for Screenplay and Story
1968 - Comandamenti per un gangster .... poster credit as Director. IMDb says he should also be credited as writer, but this needs to be confirmed.
1969 - 5 figli di cane .... credited as Director and for Screenplay and Story
1970 - Una spada per Brando .... credited as Director and for Screenplay and Story
1972 - Così sia .... credited as Director and for Screenplay and Story
1973 - Tutti figli di Mammasantissima .... credited as Director and for Screenplay and Story
- Barabba (1961) IMDb suggests he should be credited as Master of arms. He isn't in the English credits, but may be in the Italian version.
- Il colosso di Rodi (1961) IMDb suggests he should be credited as "Sword master". He isn't in the English credits, but may be in the Italian or Spanish versions.
- Oremus, Alleluia e Così Sia (1973) IMDb as Director and for Screenplay and Story