History Series / FifteenToOne

* TheAnnouncer: Anthony Hyde originally. Laura Calland (Stewart's wife) took over the position in 1989; later on, she alternated in the position with Philip Lowrie, with Sarah Wynter as an occasional substitute.

* '''Round 3''' (also known as '''The Final'''): The remaining three players were given one point for every life they had left and were restored to three lives. The round had a maximum of 40 questions. A wrong answer cost one life (losing three lives eliminated you, regardless of your score), while correct answers scored 10 points. The questions were played on the buzzers until one player gave three correct answers. After that, the player had a choice to take the next question themselves or nominate someone else to take it. Taking a question and giving a wrong answer put the game back on the buzzer, while nominating someone else and them giving a right answer would give them control. The last player left, or the one with the highest score after the 40 questions were exhausted, was the winner; in the first case, that player could keep answering questions at 10 points a pop until they either lost all their lives or went through all the questions. In either case, the winner received 10 bonus points for every life they had left to determine their position on the Finals Board. (After the first eight series, this round was played entirely on the buzzer during the Grand Final.)

* '''Round 3''' (also known as '''The Final'''): The remaining three players were given one point for every life they had left and were restored to three lives. The round had 40 questions. A wrong answer cost one life (losing three lives eliminated you, regardless of your score), while correct answers scored 10 points. The questions were played on the buzzers until one player gave three correct answers. After that, the player had a choice to take the next question themselves or nominate someone else to take it. Taking a question and giving a wrong answer put the game back on the buzzer, while nominating someone else and them giving a right answer would give them control. The last player left, or the one with the highest score after the 40 questions were exhausted, was the winner; in the first case, that player could keep answering questions at 10 points a pop until they either lost all their lives or went through all the questions. In either case, the winner received 10 bonus points for every life they had left to determine their position on the Finals Board. (In the Grand Final it was much simpler: All 40 questions were on the buzzer.)

* CurbStompBattle: If you came up against such prominent players as Daphne Fowler, Michael Penrice, or Nick Terry, there wasn't much hope for you. When Fowler and Bill [[=McKaig=]] got 432 and 433, respectively, Stewart invited the other two players in both games to come back another time as a result of this.

* CurbStompBattle: If you came up against such prominent players as Daphne Fowler, Michael Penrice, or Nick Terry, there wasn't much hope for you. When Fowler and Bill McKaig got 432 and 433, respectively, Stewart invited the other two players in both games to come back another time as a result of this.

* SomethingCompletelyDifferent: "15 to 1 for Schools" in the summer of 1999, featuring not only a different contestant structure (three teams of five) but also a vastly different round structure (points mattered throughout the whole game, and lives only mattered in the last round).
** The "Millennium Quiz" special on Christmas Day 1999 invited back 25 past contestants to compete in a four-round contest. As in the Schools edition, scores determined who advanced or dropped, and lives were only used once the field had been narrowed to three for the final. The winner received a silver trophy.

* GameShowHost: William G. Stewart throughout the original run. Nowadays, Adam Hills for celebrity specials and Sandi Toksvig for normal episodes.