The clock is ticking as contestants compete in games of lexical dexterity and numerical agility.
Countdown (Season 0)
- Special 35: Series 64 & 65 Champions (Episode 1)- Air date: 2012-07-30 - Overview: Graeme Cole v. Edward McCullagh. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- Special 36: Female Winners (Episode 2)- Air date: 2012-09-13 - Overview: Graeme Cole v. Edward McCullagh. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- Special 37: Husband & Wife (Episode 3)- Air date: 2012-09-14 - Overview: Jayshree Patel v. Magnus Mackereth. Impressionist Jon Culshaw joins Susie Dent in dictionary corner. 
- Special 38: Male Finalists (Episode 4)- Air date: 2012-09-28 - Overview: Michelle Nevitt v. Ryan Taylor. Comedian Dave Spikey joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 1 (Episode 5)- Air date: 2013-01-07 - Overview: Tom Hargreaves v. Nicki Sellars. Presenter and Hairy Biker Dave Myers joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 2 (Episode 6)- Air date: 2013-01-08 - Overview: Wayne Kelly v. Nick Wainwright. Presenter and Hairy Biker Dave Myers joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 3 (Episode 7)- Air date: 2013-01-09 - Overview: Mark Deeks v. Jack Hurst. Presenter and Hairy Biker Dave Myers joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 4 (Episode 8)- Air date: 2013-01-10 - Overview: Ben Wilson v. Conor Travers. Presenter and Hairy Biker Dave Myers joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 5 (Episode 9)- Air date: 2013-01-11 - Overview: Mark Tournoff v. Nick Deller. Presenter and Hairy Biker Dave Myers joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 6 (Episode 10)- Air date: 2013-01-14 - Overview: Darryl Francis v. David Webb. Financial journalist Martin Lewis joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 7 (Episode 11)- Air date: 2013-01-15 - Overview: Jackie McLeod v. Barry Grossman. Financial journalist Martin Lewis joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 8 (Episode 12)- Air date: 2013-01-16 - Overview: Andrew Hulme v. Steven Briers. Financial journalist Martin Lewis joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Preliminaries 9 (Episode 13)- Air date: 2013-01-17 - Overview: Ed McCullagh v. Jonathan Rawlinson. Financial journalist Martin Lewis joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 1 (Episode 14)- Air date: 2013-01-18 - Overview: Peter Lee v. Tom Rowell. Financial journalist Martin Lewis joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 2 (Episode 15)- Air date: 2013-01-21 - Overview: Kai Laddiman v. Jon O'Neill. Businesswoman and co-star of The Apprentice Margaret Mountford joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 3 (Episode 16)- Air date: 2013-01-22 - Overview: Chris Hawkins v. Jill Bright. Businesswoman and co-star of The Apprentice Margaret Mountford joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 4 (Episode 17)- Air date: 2013-01-23 - Overview: Martin Bishop v. Chris Wills. Businesswoman and co-star of The Apprentice Margaret Mountford joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 5 (Episode 18)- Air date: 2013-01-24 - Overview: David Williams v. Chris Davies. Businesswoman and co-star of The Apprentice Margaret Mountford joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 6 (Episode 19)- Air date: 2013-01-25 - Overview: Innis Carson v. Adam Gillard. Businesswoman and co-star of The Apprentice Margaret Mountford joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 7 (Episode 20)- Air date: 2013-01-28 - Overview: Christine Hunt v. Sandie Simonis. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 8 (Episode 21)- Air date: 2013-01-29 - Overview: Paul Keane v. Neil Zussman. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 9 (Episode 22)- Air date: 2013-01-30 - Overview: Dave Hoskisson v. Mike Whiteoak. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 10 (Episode 23)- Air date: 2013-01-31 - Overview: Graeme Cole v. Jack Worsley. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 11 (Episode 24)- Air date: 2013-02-01 - Overview: John Ashmore v. Kirk Bevins. Former British Olympic Swimmer Mark Foster joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 12 (Episode 25)- Air date: 2013-02-04 - Overview: David O'Donnell v. Tom Hargreaves. Distinguished journalist Kate Adie joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 13 (Episode 26)- Air date: 2013-02-05 - Overview: Wayne Kelly v. Jack Hurst. Distinguished journalist Kate Adie joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 14 (Episode 27)- Air date: 2013-02-06 - Overview: Conor Travers v. Mark Tournoff. Distinguished journalist Kate Adie joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 15 (Episode 28)- Air date: 2013-02-07 - Overview: Darryl Francis v. Barry Grossman. Distinguished journalist Kate Adie joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: First Round 16 (Episode 29)- Air date: 2013-02-08 - Overview: Andrew Hulme v. Jonathan Rawlinson. Distinguished journalist Kate Adie joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 1 (Episode 30)- Air date: 2013-02-11 - Overview: Tom Rowell v. Jonathan Rawlinson. Radio personality Ken Bruce joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 2 (Episode 31)- Air date: 2013-02-12 - Overview: Jon O'Neill v. Darryl Francis. Radio personality Ken Bruce joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 3 (Episode 32)- Air date: 2013-02-13 - Overview: Chris Hawkins v. Conor Travers. Radio personality Ken Bruce joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 4 (Episode 33)- Air date: 2013-02-14 - Overview: Chris Wills v. Jack Hurst. Radio personality Ken Bruce joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 5 (Episode 34)- Air date: 2013-02-15 - Overview: Chris Davies v. David O'Donnell. Radio personality Ken Bruce joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 6 (Episode 35)- Air date: 2013-02-18 - Overview: Innis Carson v. Kirk Bevins. GP turned comedian Dr. Phil Hammond joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 7 (Episode 36)- Air date: 2013-02-19 - Overview: Christine Hunt v. Jack Worsley. GP turned comedian Dr. Phil Hammond joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Second Round 8 (Episode 37)- Air date: 2013-02-20 - Overview: Dave Hoskisson v. Neil Zussman. GP turned comedian Dr. Phil Hammond joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Quarter-Finals 1 (Episode 38)- Air date: 2013-02-21 - Overview: Jonathan Rawlinson v. Neil Zussman. GP turned comedian Dr. Phil Hammond joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Quarter-Finals 2 (Episode 39)- Air date: 2013-02-22 - Overview: Jon O'Neill v. Jack Worsley. GP turned comedian Dr. Phil Hammond joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Quarter-Finals 3 (Episode 40)- Air date: 2013-02-25 - Overview: Conor Travers v. Kirk Bevins. Comedienne Jenny Eclair joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Quarter-Finals 4 (Episode 41)- Air date: 2013-02-26 - Overview: Jack Hurst v. David O'Donnell. Comedienne Jenny Eclair joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Semi-Finals 1 (Episode 42)- Air date: 2013-02-27 - Overview: Jonathan Rawlinson v. Jack Hurst. Comedienne Jenny Eclair joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Semi-Finals 2 (Episode 43)- Air date: 2013-02-28 - Overview: Jon O'Neill v. Conor Travers. Comedienne Jenny Eclair joins Susie Dent in dictionary corner. 
- 30th Birthday Championship: Grand Final (Episode 44)- Air date: 2013-03-01 - Overview: Jack Hurst v. Conor Travers. Comedienne Jenny Eclair joins Susie Dent in dictionary corner. 

Seasons
Episodes 26
Episodes 52
Episodes 51
Episodes 51
Episodes 50
Episodes 54
Episodes 50
Episodes 59
Episodes 47
Episodes 50
Episodes 50
Episodes 50
Episodes 50
Episodes 63
Episodes 50
Episodes 55
Episodes 55
Episodes 70
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 65
Episodes 58
Episodes 65
Episodes 64
Episodes 65
Episodes 60
Episodes 130
Episodes 130
Episodes 130
Episodes 121
Episodes 123
Episodes 114
Episodes 130
Episodes 42
Episodes 67
Episodes 127
Episodes 109
Episodes 122
Episodes 103
Episodes 112
Episodes 112
Episodes 119
Episodes 153
Episodes 150
Episodes 120
Episodes 126
Episodes 119
Episodes 104
Episodes 111
Episodes 100
Episodes 83
Episodes 83
Episodes 66
Episodes 93
Episodes 67
Episodes 118
Episodes 107
Episodes 83
Episodes 5
Episodes 1
Episodes 113
Episodes 0

Episodes 5
Episodes 3
Episodes 0
Episodes 44