Former Irish Republican Army member Niall Hennessy lives in Belfast, Ireland, with his wife and daughter amid the ongoing Irish-British conflict. Though he still knows people in the IRA, including fugitive leader Tobin, Niall has given up his violent ways. One day his family is caught in a chaotic street shootout and killed by British forces. Overwhelmed with rage and hunted by a Scotland Yard inspector, Niall heads to London to exact his deadly revenge.
You can now watch Hennessy online on the following streaming providers in the United States.
| Directing | Don Sharp | Director |
| Writing | John Gay | Screenplay |
| Editing | Eric Boyd-Perkins | Editor |
| Camera | Ernest Steward | Director of Photography |
| Production | Peter Snell | Producer |
| Writing | Richard Johnson | Original Story |
| Production | Samuel Z. Arkoff | Executive Producer |
| Sound | John Scott | Original Music Composer |
| Production | Irene Lamb | Casting |
| Art | Ray Simm | Production Design |
| Art | Bert Davey | Art Direction |
| Art | Simon Wakefield | Set Decoration |
| Costume & Make-Up | Ronnie Cogan | Hairdresser |
| Costume & Make-Up | Gerry Rex | Wigmaker |
| Costume & Make-Up | Tom Smith | Makeup Artist |
| Production | Tim Hampton | Production Supervisor |
| Sound | John Scott | Conductor |
| Production | Stuart Freeman | Location Manager |
| Directing | Barry Langley | Assistant Director |
| Directing | Mike Higgins | Second Assistant Director |
| Camera | Herbert Smith | Camera Operator |
| Camera | Michael Temple | Assistant Camera |
| Art | Simon Wakefield | Set Dresser |
| Art | Alf Pegley | Props |
| Directing | Ann Edwards | Continuity |
| Sound | Les Hammond | Sound |
| Sound | Gerry Humphreys | Sound |
| Sound | David Stephenson | Boom Operator |
| Sound | Vernon Messenger | Sound Editor |
| Sound | Ian MacGregor-Scott | Assistant Sound Editor |
| Production | Douglas Noakes | Production Accountant |
| Production | Marilyn Clarke | Production Coordinator |
| Crew | John Richardson | Special Effects |
| Crew | Gerry Crampton | Stunt Coordinator |
| Production | Lesley Keane | Production Secretary |
| Camera | Harry Gillard | Still Photographer |
| Production | Dennison Thornton | Publicist |
| Costume & Make-Up | Camilla Farmer | Costume Coordinator |
| Costume & Make-Up | Jackie Cummins | Wardrobe Supervisor |
| Production | Steve Previn | Production Executive |
| Crew | Vic Armstrong | Stunts |
