Mastermind BBC2, 8pm One of the highlights of last Christmas was watching Hacker T Dog steal the show in Celebrity Mastermind's black chair as he answered a series of head-scratching questions. As series 15 of the regular run continues, it's only humans allowed as question master John Humphrys continues his quest to find the 2017 champion. Previous specialist subjects have included flags of the world and the colour films of Danny Kaye, but as regular viewers know only too well, an impressive round in the first half can be undone if the player's general knowledge is weak. Let's hope the latest brave contestants are good all-rounders as Humphrys starts and finishes another gripping show.
Codi Pac S4C, 8.25pm Wrth iddo barhau a'i daith i ardaloedd gwahanol o Gymru, bydd Geraint Hardy yn ymweld a Betws-ycoed yr wythnos hon. Dyma gartref dros dro i'r cerddwyr, hafan i'r anturiaethwyr a phorth Eryri. Bydd cyfle i grwydro'r ardal yng nghwmni Edmund Rees o'r Ganolfan Groeso leol i glywed ychydig o hanes yr ardal brydferth hon.
Teach My Pet to Do That ITV, regions vary Animal lover, comedian and presenter Alexander Armstrong opens the doors of his multi-species pet training school, greeting Kevin the chow chow dog and Rambo the miniature New Zealand kunekune pig, to see if they can be taught to beg, spin and roll over. This week's star pet is the late Pudsey, the first dog to win Britain's Got Talent. Plus, the show's trainers hit the road to see if they can train two chickens to play the world's most unusual game of Celebrity Guess Who by attempting to pick out the faces of Ant McPartlin and Katie Price from a constellation of stars.