A trio of social networkers who met online take on three committed vegetarians.

A father, son, and daughter-in-law square up to three postgraduate chemistry students from Oxford University.

A team of professional analysts with degrees in modern languages, English, and maths pit their wits against a trio of editors who delight in their meticulous attention to detail.

A classics graduate, a maths graduate, and a history graduate united by a shared love of running face up to three colleagues from a creative engineering company.

A husband and wife and their best friend who share a passion for managing online football teams take on three friends from London with a collective love of all things historical.

Three friends with a mutual love of the Listener crossword puzzle pit their wits against a trio of choristers from Sheffield University.

A software developer, IT manager, and marketing manager who all row in the same boat take on three ladies with a shared passion for foreign languages.

Three aficionados of the Scottish rock music scene pit their wits against three members of an executive council trade union group.

Three online pals take on a trio of history buffs in the first of the quarter-finals.

A team of rowers encounter three fans of the Listener crossword in the second of the quarter-finals.

A father, son, and daughter-in-law pit their wits against three members of an executive council trade union group in the third of the quarter-finals.

Three professional analysts square up to three colleagues at a creative engineering firm in the last of the quarter-finals.

In the first of the semi-finals, three fans of the Listener crossword take on a trio united by their love of all things historical.

In the second semi-final, a trio of analysts and three members of an executive council trade union group fight it out for a place in the series finale.

A trio of Listener crossword fans and three members of an executive council trade union group compete in the 3rd/4th place play-off.

In the series finale, three professional analysts square up to a trio of history buffs for the right to be named series five champions.