Three kung fu experts (Feng Lu, Chiang Sheng, and Sun Chien) from the North Shaolin temple are summoned to train the Qing army, but must first prove themselves in a friendly fight against the current South Shaolin trainers. North wipe the floor with their cocksure opponents. Later that day, in a move designed to pit North vs South and destroy Shaolin once and for all, devious Qing General Pu (Wang Lung-wei) kills the shamed South Shaolin trainers, pinning the blame on the new arrivals from the North.
On hearing of his students' deaths, the South Shaolin master sends three more of his men to exact revenge, but this time around, two of them are accidentally killed by the Northerners, the third injured fighter returning to his temple to relay the bad news. Realising that none of his students are good enough to beat the North Shaolin, the South Shaolin teacher picks three more men (played by Lo Mang, Kuo Chui and Pai Wei), each to train under a different kung fu master. Six months later, the trio leave to face the North Shaolin, even though both North and South now suspect that they are being manipulated.
With the Five Venoms on top form, kung fu fans can rightfully expect some astonishing old school martial arts action in Chang Cheh's Invincible Shaolin, including an entertaining training sequence that shows off the impressive skills of Lo Mang, Kuo Chui and Pai Wei (Lo Mang does one finger press-ups with a large polystyrene rock placed on his back!!!) and a wonderfully bloody final battle that makes use of lots of red paint as North and South battle it out before joining forces to kick some well-deserving Qing butt. Be warned though, even though evil General Pu gets his comeuppance, it's not without several of the supposedly invincible Shaolin fighters also buying the farm (the Northern fighters dying in front of their helpless fiancées).
