Secret Smile (ITV1)

Plastic Surgery Ruined My Wife (five)

THE main pleasure of the thriller Secret Smile is watching the new Doctor Who, David Tennant, being bad.

As the Time Lord, he'll be called upon to save the world from time to time but in a nice early Saturday evening sort of way. As creepy Brendan Block in Secret Smile, he was downright nasty to the women in his life. If he deals with Daleks, Cybermen and other adversaries as ruthlessly as he does females, then the universe will be a safer place.

Brendan isn't a nice man, turning from charmer to psychopath. He and Miranda (Kate Ashfield) tumble into bed without even asking each other's names.

Ten days later, their affair is over. But Brendan won't let go, so determined to keep it in the family that he gets engaged to her sister Kerry (Claire Goose). He also mugs Miranda's new boyfriend, pushes her suicidal brother over the edge and charms her parents.

This is hardly the way to win back Miranda, although revenge more than romance is on Brendan's mind. And it gets worse in the second part tonight with a twist in the tale that the more alert will see coming.

Tennant is rather good at being bad and you have to admire Brendan's tenacity. Ashfield and Goose, together again as sisters after playing best friends in Sunday's Perfect Day drama, don't stand a chance.

They fall into the trap set by Brendan, although it was booby traps that caught out the men in Plastic Surgery Ruined My Wife.

Males, being shallow creatures, were initially all in favour of partners increasing their bust size. Then we heard of first love crushed by the weight of double D implants which, for some of us, wouldn't be a bad way to go. As rock musician Gregg put it: "If it makes her life better and I get something to play with as well".

His enthusiasm for girlfriend Lea's boob implants - the biggest in the UK, taking her from double A to double M - waned once people ignored him in favour of her assets. The poor chap became jealous and insecure after she spent £40,000-£50,000 on breasts like beach balls. He got a booby prize instead of a trophy girlfriend.

Tony's 30-year marriage to Jane suffered too. Her troubled past involved an abusive father and a fear of looking like her mother. Her solution was extreme - she had surgery to make her look oriental. Tony said he loved her very much but preferred the old, blonde Jane.

Jazz musician Stuart found that his wife Susan's chest came between them which, in some situations, could be quite stimulating but not when she insisted on having surgery because "they were long and dangling like a basset hound's ears". She had breast augmentation, he stopped sleeping with her.

A new look also led to Natalie and Ed breaking up. She thought vaginal surgery would revolutionise her love life. It did - Ed left her.