Zoo (Ten, Thursday) is such a one.

The plot is that around the world the animals are turning against humans.

In Los Angeles two lions, brought up as cubs in a zoo, kill their keeper, escape the zoo and kill two more people before being found and shot.

Environmental reporter Jamie Chapman believes it's because of the food they're eating.

However vet Mitch tells her that it's absolutely not the food, but she leads him on to a bigger mystery, cats kidnapped from the upper middle class homes.

Meantime in Africa, safari guide Jackson Oz and his best mate Abraham try to find out why another safari firm hasn't been in contact.

The headquarters are empty so they go out into the countryside and Abraham, as he examines their vehicle, gets killed (or so we believe) by a lion, and out of the long grass comes a screaming girl, Chloe, who persuades Jackson to escape five lions heading towards them.

The lions get to their truck but Jackson manages to get away, but one lion must have bitten into the radiator because they run out of water.

They have to walk to get help and the lions track them and there's a scene where Jackson and Chloe face a huge lion on a cliff top and Jackson tries to stare it down.

Back in LA, Mitch finds the cats and brings Jamie to see them.

There they are hundreds of them, draped on trees above a school playground that will be filled with children the next day.

Terrible production values, acting so-so, plot ridiculous, but so entertaining I'm going to keep watching.