Truth be told, it's not even worth giving half a star. Talk about a BIG disappointment! I've seen all the Ice Age movies and thought the first one was lacking, but this one was Horrible and not really thought out very well. If this comes after the Collision Course, then where are Shirra and Brooke? Second, when in the lost world, where is Rudy? They made it a big deal that Buck goes after and catches him in the end of the Dinosaur Ice Age movie. They also never mentioned Peaches when going through the storyline on the cave wall. I'm pretty sure that's something no mother could ever forget especially a mammoth mother. Then they left out their iconic character that really makes the show, Scrat. That squirrel is what makes Ice Age funny! Plus, this storyline really doesn't even fit with the other Ice Age movies. Orson, the "superhero squad", or the balance of the lost world was never mentioned when we first meet Buck so where did all of that come from of a sudden? I know they want to give Buck a back story, but at least get all the facts straight first, then figure out how to tie it in with the others! Plus, not having the same voice actors makes you wonder just how much time and effort really went into this one especially with the not so great graphics. Super let down on this one!!