Horizon: What Is One Degree? (BBC2, 9pm) Comedian and erstwhile physicist Ben Miller investigates this titular question of temperature.
Glee (E4, 9pm) Season 2 of the comedy-drama musical. Stars Lea Michele, Matthew Morrison, Jane Lynch, Chris Colfer & Cory Monteith.
The Biggest Loser (ITV1, 9pm) Weight loss series. Presented by Davina McCall.
One Born Every Minute (Channel 4, 9pm) Series 2 of the documentary from a Southampton maternity ward.
Is Oral Sex Safe? (BBC3, 9pm) Investigation into oral sex.
Hell's Kitchen USA (ITV2, 9pm) New series of the culinary challenge series. Hosted by Gordon Ramsay.
Episodes (BBC2, 10pm) Brand new comedy series about married British writers who travel to the US to help adapt their hit sitcom for American audiences. Stars Stephen Mangan, Tamsin Greig & Matt Le Blanc.
Shameless (Channel 4, 10pm) Series 8 of the drama about a family of unemployed wasters. Continues every evening until Friday, for its first week.
No Ordinary Family (Watch, 8pm) Season 1 of the US superhero drama. Stars Julie Benz, Michael Chiklis, Romany Malco, Kay Panabaker, Autumn Reeser & Jimmy Bennett. Double-bill.
Jamie's Fish Supper (Channel 4, 8.55pm) Five-minute fishy recipe from chef Jamie Oliver. Continues Thursday.
Taggart (ITV1, 9pm) New series of the long-running Scottish cop drama.
Hugh's Big Fish Fight (Channel 4, 9pm) Three-part series looking at the fishing industry. Continues Wednesday, concludes Thursday.
CSI (Five, 9pm) Season 11 of the US crime drama.
Arthur's Hell On High Water (Channel 4, 8pm) Documentary about the fishing industry. Presented by Arthur Potts Dawson.
The Modern Age Of Coach Travel (BBC4, 9pm) Documentary about coach holidays.
Relocation, Relocation (Channel 4, 8pm) Return of the property series. Presented by Kirstie Allsopp & Phil Spencer.
Ripped From The Cockpit: BA Flight Of Terror (Five, 8pm) Documentary about the British Airways jet that avoided a crash at 17,000 feet.
Kidnap & Ransom (ITV1, 9pm) Three-part drama about a hostage negotiator trying to help get a woman released from South Africa. Starring Trevor Eve, John Hannah & Helen Baxendale.
The Great Outdoors (BBC2, 10pm) Three-part comedy about ramblers, previously shown on BBC4.
The BRITS Launch 2011 (ITV2, 8pm) Appetizer for this year's BRIT awards, revealing the nominees. Hosted by Fearne Cotton.
Can't Take It With You (BBC2, 9pm) Series helping families decide how to construct their Last Will & Testament.
Comedy Rocks With Jason Manford (ITV1, 9pm) Comedy series presented by Jason Manford. Guest comedians are Micky Flanagan, Lee Nelson, Russell Kane & Jim Jefferies.
Heston's Fishy Feast (Channel 4, 9pm) Special episode where chef Heston Blumenthal tries to cook an alternative seafood dish.
Fast & Loose (BBC2, 10pm) Brand new improvisational comedy show. Stars Hugh Dennis, Greg Davies, Pippa Evans, Marek Larwood, Laura Solon & Justin Edwards.
True Blood (FX, 10pm) Season 3 of the US vampire drama. Stars Anna Paquin, Stephen Moyer, Alexander Skarsgard, Denis O'Hare & Sam Trammell.
Comic's Choice: Alan Davies (Channel 4, 10pm) New series where comedians discuss the comedy that helped shape their own careers, beginning with Alan Davies. Hosted by Billy Bailey. Continues on Monday with Lee Mack.