When I was a kid I used to love these types of movies. Movies like 'Revenge of the Ninja,' 'Pray for Death,' and this one were all regular staples of my weekend viewing. I had ninja toys, ninja outfits, and daydreamed about ninjas at school. If it had Sho Kosugi or Jackie Chan, I was watching it. 'Enter the Ninja' is largely regarded as one of the films that started the ninja craze in the 80s (and spawned several indirect sequels). It is directed by Menahem Golan, who, along with his cousin, formed the nucleus of the great exploitation studio Cannon films, which gave us a decades worth of awesome fare involving ninjas, Chuck Norris, and Michael Dudikoff.
Franco Nero stars as the ex-Army guy turned ninja Cole, who travels to the Philippines to help his buddy out, who is having trouble with some local unscrupulous businessmen who want him to sell his land. Along the way, Cole saves the day and manages to show himself an honorable ninja by banging his friend's so very hot wife, Mary Ann (Susan George)- to be honest, his friend was practically begging him to, since he "couldn't get it up" for her, due to his recent binge drinking and all. The interplay between Cole (who sports a sweet 'stach) and Mary Ann is hilarious: in one scene, Mary Ann is stroking a big shotgun while staring him down, and asking him if he wants to "come" into town with her in another. Not to be outdone, our hero asks, while being frisked, if she found "anything interesting" down there.
Sho Kosugi co-stars in this; he plays a baddie who isn't really a baddie, just jealous of Cole and overzealous for honor. He's duped by the baddies into thinking he's doing the right thing but he realizes his mistake at the end. Kosugi also choreographed everything- and for an early 80s film, it's typical action, probably on par with Gymkata or the latest Chuck Norris.
The bad guy, played by Christopher George, is very funny in this, and is constantly overacting, raising his voice, and berating his assistant Mr Parker that he "wants his ninja too!" like a 4 year old.
I'd say that this is one of the beginnings of the Cannon formula, one that would propel Golan-Globus to incredible heights into the 80s. If you had a Ninja fest of some kind, this would definitely be included, along with 'American Ninja' and 'Pray for Death.'