I didn't vote for it, but I think the first one has some dark moments, like when Littlefoot mom dies that fight with the T-Rex, there was also that scene where Petrie was thought to have died, Ducky was so sad. I never saw the 4th as being the dark, even with the Grandpa possiblity of dieing but that's just me. I saw the 7th as being dark for one Pteraon was watching those meat eaters killing off those dinos, then one just dropping over the edge to her doom and he did nothing to help. Well those are my opinions. I never saw the 13th one.