Three NHS medics take on a team of Librarians in the first episode of the series.

A team of gaming enthusiasts take on three animal lovers in this opening heat.

Three space enthusiasts take on a team of music lovers in this opening heat.

A team of golfers take on three wildlife lovers in this opening heat.

A team of disco lovers take on three film fans in this opening heat.

A team of computer programmers take on three former Sheffield housemates.

A team of walkers take on three knitters in this opening heat.

A family team takes on three data science workers in the last of the opening heats.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who lost their opening heats return for a last chance to stay in the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who lost their opening heats return for a last chance to stay in the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who lost their opening heats return for a last chance to stay in the competition.

Two teams who lost their opening heats return for a last chance to stay in the competition. They'll try to draw together the connections between things which seem utterly random at first glance.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who won their opening heats return for the next stage of the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who won their opening heats return for the next stage of the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who won their opening heats return for the next stage of the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who won their opening heats return for the next stage of the competition.

Two teams who've won a game and lost a game return for a last chance to stay in the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who have won a game and lost a game return for a last chance to stay in the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who've won a game and lost a game return for a last chance to stay in the competition.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. Two teams who have won a game and lost a game return for a last chance to stay in the competition.

A team of space enthusiasts take on three animal lovers in the first of the quarter-finals.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. A team of golfers face three NHS doctors in this quarter-final.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. A team of walkers take on three film fans in this quarter-final.

A team of computer science workers take on three disco fans in the last of the quarter-finals.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. In the first of the semi-finals, two teams battle it out for a place in the series finale.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. It's the last of the semi-finals, with two teams are battling it out for a place in the series finale.

Victoria Coren Mitchell hosts the third-place play-off as two teams try to work out what comes next in this sequence: 12. Holbein, 13: Hat and 14: Paris.

Victoria Coren Mitchell hosts the series where knowledge will only take you so far. It's the 400th episode and the series finale, with two teams battling it out to be named champions.