Its Duke Nukem.
The guy is like a cross between Terminator, Ivan Drago and the Duke (John Wayne). Its a silly game but with like really messed up theme but that somehow it entertains. You can visit night clubs, use the can, shoot at police/aliens/pigs... and get to use all these catchy phrases like: "Come get some" or "Shake it, baby", etc. Whats really amazing is that you´ll be able to travel through time and see how decadent modern and past times were alike.
Now... to the important stuff. The game is like your ordanary plataform adventure game, kind at par with Tomb Raider but with not so amazing graphics and the main character isn´t that agile.
So thats pretty much the core of the game... quite fun actually but my humble suggestion... you can play the game normally but you´ll have much more fun if you use the cheat codes, thats were the real mayhem take part and spices up the game a bit.
I suggest you borrow (or rent it if that would be the reason) it cause after you´re done with it the first time, theirs kind of no reason to go back to it again.