The Brutes` Banquet

Two millionaires who bet on human bloodsports hire a top assassin, Spartacus, to duel with Golgo 13 under the guise of protecting themselves from him. They have the Colosseum rigged with cameras and microphones in order to watch. Golgo 13 emerges from the duel the winner and reveals to Spartacus the recording equipment. Angry that he was used, he hires Golgo 13 to kill the millionaires right before he dies. The millionaires use their influence to fly to South Africa to a safe place whilst being guarded by the Sicilian mafia and theirs being the first plane out of Rome. However they are shot dead upon arrival from another plane on the tarmac that had overtaken them from Rome whilst they had refueled in Nairobi.