The 36 characters that appeared at the end of the movie

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I don't think than the cable TV versions were 3D at all. I think the DVD lets you choose but the TV version doesn't.

No, but you can almost tell where the effect are.

This a good thing because 3D gives me a headache.

I can tell by your post that you missed the first 2 Spy Kids Movies, but yes all the characters that are in the end are from the first 2 movies where they were introduced. Most of Cortez family are introduced in the first Spy Kids movie, the only 2 members of the Cortez family that I can tell you that are not in the first movie are the two grandparents. They were introduced in the second movie with a lot of other new characters. And from what I can also tell is that you watched the 2D version of the movie. And there are 2 versions of the movie 3D and 2D, I can tell you that the big difference I can tell you between the versions is the 3D version has a prologue that runs I would say 3 minutes making it 3 minutes longer then the 2D version, and also with 2D that won't tell you are the signs to either put on or take your 3D glasses off. The title of the movie for the 2D version is Spy Kids 3: Game Over. On the dvd it has both the 3D and 2D versions on 2 different discs. On the 3D version of the movie there are a few things that look like are coming out at you, but otherwise it is just like a normal 3D movie. If you still haven't seen the first 2 Spy Kids movies watch them, the only ways to see the 3D version of the movie to check your local library to see if they have it, or if they can order for you from another library, or if you know somebody that owns it on dvd, and are willing to loan you the movie that is if you don't want to buy the dvd. And also ABC Family also showed it today and it was the 2D version that they showed.