Hello , I have the game ratchet & clank and it's amzing game , but you know I don't like playing game who have another part before because there is some other parts of this game in playstion 2 and I didn't play them so I said to myself you don't under stand the story line , I mean do I have to start from the beginning so I can under stand the story line because that is my style me I don't play the games I have to first under stand the charcters and the story line in the game for example prince of persia I use to have part 3 I didn't play it when I find out there is another two part before the third one so I stop it .
So please help do I have to start from the beginning of the game ? Or it doesn't need to .

No you don't have to,if you feel like you would like to play the ones before it then do that before or after or whenever you feel like but don't let it stop you from enjoying actually playing the games, after all that's what they're there for.

I've played this game and not the other ones and didn't feel "lost". You just run around and shoot stuff and collect parts to build robots or something... I didn't really care about the story at all.