IT'S said the Great Wall of China is the only man-made feature on Earth that's clearly visible from the moon. It's no longer alone - today the queues outside Hongkong's video stores will be more than long enough to be seen from outer space. Customers will be thronging to watch anything rather than sit yet again through Gremlins (Pearl 9.45pm) or Children of the Corn (World 9.30pm), both of which have been shown more times than Lu Ping's had hot congee. STAR-gazers may suffer a similar familiarity problem with the mini-series Rage of Angels (STAR Plus 8pm). However, there's some compensation for fans of felines in Roger Tabor's documentary series Cats (BBC 9.25pm), and for Sevens supporters in highlights of the first day of this year's Invitation Sevens (Prime Sports 10pm). THE one consistent highlight of Monday night is still Cheers (Pearl 9pm) the long-running series which is about to come to an end in the US. Don't worry, we have more than a year's worth to see. This week Lilith's domineering mother pays a visit. Also, Norm comes into some money and Rebecca tries to confront him about paying his huge outstanding bar tab. Definitely one for the too-hard basket. A FAR newer series destined never to be described as long running, is Step by Step (World 7.30) which began last week. It started well with Carol (Suzanne Somers) and Frank (Patrick Duffy) playing newly-weds who still had to tell their respective childrenthey'd got married. But it took less than 20 minutes to turn to mush as their initially hostile brats - they have three each - saw the error of their ways when one of them fell ill . . . along with most of the audience. GREEN Pages (STAR Plus 6pm) is a new environmental series aimed at teenagers, but with a message for all ages. It aims to explain how to take action to save the environment on a local and global level. Hongkong needs this series - the BYOB (Bring Your Own Bag) ad campaign can't do it alone. AMONG the better holiday movies is Plaza Suite (World 11.50am, Original Running Time 115 mins) comprising three one-act plays written by Neil Simon and starring Walter Matthau, which means there are at least two good reasons for watching. It's not Simon'sbest, but it should raise a smile. JOHN Cassavetes takes on his customary role of a man going through his mid-life crisis in Tempest (Pearl 11am, ORT 140 mins), a film that has more in common with Woody Allen on a rainy day than with Shakespeare. Worth watching for Cassavetes, the lovely scenery and the fact that Gena Rowlands, Susan Sarandon and Raul Julia co-star. CHILDREN with long attention spans should enjoy Tommy Tricker and the Stamp Traveller (Pearl 3.05pm, ORT 105mins), a magical tale about a boy who can fly on a stamp. Those of a more restless nature are unlikely to stay the distance.