TONIGHT'S Good Morning Vietnam (Pearl, 9.45pm, Original Running Time 108 mins) is Robin Williams' movie all the way. He plays motor-mouthed disc jockey Adrian Cronauer who's dumped in Saigon in 1965 complete with non-issue uniform and identical attitude. His manic monologues are achingly funny and outrageous - and apparently far better than the real Adrian Cronauer on whom the movie's based. Williams sends up the Vietnam conflict as part Wizard of Oz, part fashion show (''the enemy's wearing black . . . casual during the day but dress it up with a simple string of pearls and you're ready for a night out''). The actor employs a similar kaleidoscope of characters in his voice-over for the Genie in Walt Disney's latest animated feature Aladdin . Williams' tour de force performance, as well as some great 60s soul sounds, largely disguises a weak storyline, which too neatly allows viewers a glimpse of Vietnam's lighter and darker sides, via a sweet Vietnamese girl for whom Cronauer falls, and her VC-connected brother. Often the musical interludes are largely irrelevant, but they look and sound great. FOUR years in the making, The Gods Must Be Crazy II (World, 9.30pm, ORT 97 mins) is a follow-up to the original surprise hit comedy and again stars N!Xau as the innocent Kalahari bushman. This sequel comprises several inter-mingling tales involving a high-powered American businesswoman who's stranded in the desert; poachers seeking elephant tusks; the accidental kidnapping of N!Xau's children; and two soldiers who keep attempting to take each other hostage. Like the original, this movie enjoyed enormous popularity, spawning more sequels including a local version released earlier this year, called Crazy Hongkong. WORLD sets off on the Road to Wembley (8.30pm) with Charlie Charters presenting highlights from the matches leading up to England's most coveted soccer title, the FA Cup. The final will be played at Wembley on May 15. Welcome though this programme is, it's odd watching live coverage of the quarter finals on ATV Home one week, and the next being urged to speculate on the outcome of an earlier game. THE Mandarin Moonlight movie, Founding Ceremony (World, 11.40pm, ORT 162 mins) depicts the formation of the Republic of China and the prolonged struggle between Mao Zedong and Chiang Kai-shek. At nearly three hours, this 1989 movie is fairly prolonged, too. Li Chen-fun and Xiu Kwai-yuen directed. IT'S difficult to decide who gives the most offensive performance in Foreign Body (Pearl, 2.25am, ORT 108 mins), a throwback to the British sex comedies of the 1950s. In a real casting U-turn, Victor Bannerjee goes from starring in A Passage to India to playing a gormless Indian immigrant Ram Das who poses as a Harley Street doctor and finds his wealthy female patients are more than willing to take him to their bosoms, as it were. Warren Mitchell ('Til Death Us Do Part) dons a terrible black-up job to play Ram's cousin IQ, but he is, at least, charming rather than idiotic.