While being a shameful copy of Fist in most ways, International Karate managed to introduce a few novel features. The main one was the 'International' bit, which means that the game is played against a series of backdrops representing various parts of the world. Then there was the speech, which is about as successful as always on the Speccy. And finally the bonus screens. Hmm.
Other than that, International Karate is about as standard a beat-'em-up as you're likely to see. It doesn't quite have the slickness of Fist, and is definitely lacking when it comes to excruciating crunches and things, but it makes a reasonable attempt at animation which is something.
International Karate +, the sequel, startled us all with the introduction of a third character.