Approximately four minutes of quick-fire specialist and general knowledge questioning confronts four doughty contenders for this year's Mastermind title.
Memory, clarity, concentration, tactics, and nerve are all required in this formidable challenge to the intellect.
Tonight's contenders are: DENNIS BIRD, Civil Servant
JACQUELINE PEARSON , postgraduate student
MICHAEL MUNN , lorry driver
MARTIN CABOURN SMITH , Chartered Accountant
This second heat brings together contestants who between them have a wide variety of talent.
As they grapple with the answers to questions both specialist and general knowledge, they will require all their mental faculties to be ticking over in top gear in this quest for the title Mastermind 1975. Tonight's contenders are:
DOROTHY F. BUSHELL , unemployed RICHARD J. EVERETT , schoolmaster MARGARET ASKEW , journalist ARTHUR GERARD, retired
Nottingham University provides the setting for tonight's ' Battle of the Polymaths.'
The occupations represented are as diverse as the specialist subjects that have been chosen.
Tonight's contenders are: CLIFFORD WARNER, Local Government Officer
JENNIFER SMALLMAN, librarian REV JOHN GIBSON , priest JOHN HART , schoolmaster
An American at Oxford University, a Miner, a Chartered Surveyor and a Systems Analyst make up the group who are in contention tonight for the Mastermind title. They are:
RICHARD CARDEN, Systems Analyst JACK TOMLINSON, Miner
VICTOR SIDE, Chartered Surveyor STEVEN SCHNEEBAUM, Student
Introduced by Magnus Magnusson from Sheffield University Tonight's contenders are: MARTIN MCCLELLAND, sheetmetal worker
GEORGE BULL, solicitor
PAULINE FOWLING, teacher
KENNETH BURTON, railway clerk
From which town will tonight's winner emerge?
This group of would-be 'Master-minds' come from Northwich, Southport, Liverpaol and Wallasey. Tonight's contenders are:
CECIL CRILL, retired Naval Officer JEAN HANDLEY, teacher RONALD MCGOWAN, Inspector of Taxes
NOEL FAGAN, unemployed
Bath University provides the forum tonight for four more hopeful ' Masterminds.'
Tonight's contenders are:
FRANCIS HOWE, schoolmaster IVOR JEFFERY-MACHIN, Anglican priest
GLYN COURT, teacher
JAMES COATES, retired bank official
So far the preceding seven heats of Mastermind have been won by the men.
Will the lone woman in tonight's group from Wales win through to the Semi-finals?
Tonight's contenders are:
RICHARD DALE, schoolmaster GENA DAVIES, unemployed VISCOUNT DAVID TENBY, Member of House of Lords
ANTONY CARR, university lecturer
The venue for tonight's heat is the Open University at Milton Keynes.
Tonight's contenders are:
PHILIP SKOTTOWE, Barrister GEORGE EARNSHAW, Lecturer JENNY JOHNSON, Histopathologist DAVID BURNS, Local Government Officer
In the space of 30 minutes over 150 specialist and general knowledge questions will be offered to tonight's four contenders. How many of them will you get right? Tonight's contenders are: ROBERT WORGER, teacher SUSAN WALKER, university language assistant
ALEC STEPHEN, teacher NEIL CROCKFORD, risk management consultant
This 11th heat comes from Scotland's ancient seat of learning, St Andrew 's University.
Tonight's contestants are:
KATHERINE WATT, retired teacher
JAMES MURRAY, retired headmaster FRANCIS LAMBERT, lecturer IAN SMYTH , schoolteacher
From St Andrews University, Scotland, contestants from Northern Ireland, Southern Ireland, and Scotland battle for a place in the semi-final round.
Tonight's contestants are: ALAN BLACKBURN, student ARNOLD O'HARA, teacher
TIMOTHY PAXTON, schoolmaster
GEORGE JOHNSTON, schoolmaster
Manchester University provides the venue for this semi-final, the first of four, one of which is reserved for the four best runners-up.
Tonight's semi-finalists and their special subjects are:
STEVEN SCHNEEBAUM, law student, United States Constitution JOHN HART, schoolmaster, Rome and Romans: 1st Century BC MARTIN MCCLELLAND, sheet-metal worker, British Military Campaigns: 1700-1815
DAVID BURNS, Local Government officer, Life and Reign of Richard III
The winner of this match will go forward into the final.
Tonight's Semi-finalists are from Bournemouth, Wallasey, Bangor (Wales), and Glasgow. They are:
IVOR JEFFERY-MACHIN, Anglican Priest, Dutch 17th-century painting
NOEL FAGAN, former sales manager, The two World Wars, 1914-18 and 1939-45 ANTONY CARR, university lecturer, Hundred Years' War
FRANCIS LAMBERT, university lecturer, Brazil since Independence - 1822
This third Semi-final comes from Southampton University. MARTIN CABOURN SMITH, chartered accountant, British Naval History of the First World War
NEIL CROCKFORD, risk management consultant, Isle of Wight
GEORGE JOHNSTON, schoolmaster, Life and Works of Liszt ARTHUR GERARD, retired civil servant, British Cathedrals
This Semi-final is devoted to the four best runners-up from the initial 12 heats, and it is the last chance for a woman to make it to the Final. But there are three of them lined up against a lone male. So the odds should be in their favour. The contestants and their special subjects are:
MARGARET ASKEW , journalist. The Life and Career of Stonewall Jackson
JACQUELINE PEARSON. university lecturer. The Life and Works of Christopher Marlowe
GENA DAVIES, unemployed, Gemology ALAN BLACKBURN, law student, History of Northern Ireland from 1921
Four worthy contestants line up for this the final hurdle to the championship title of Mastermind 1975. They are:
JOHN HART, schoolmaster, Athens in 5th Century BC
FRANCIS LAMBERT, lecturer, Cuban History, 19th century onwards
GEORGE JOHNSTON, schoolmaster, French Literature 1600-1900
BEST RUNNER-UP