It may seem hard to believe, but “Ice Age: Collision Course” is actually the fifth entry in the franchise, and nobody seems more surprised by the overwhelming success of the series than its producers. Scrambling to come up with plots to keep the cinematic cash machine open, the production finally reaches a limit to Paleolithic shenanigans with “Ice Age: Collision Course,” which doesn’t really bother with a story, charging full speed ahead with cartoon gags instead, perhaps realizing there’s nowhere left to go with the initial “Ice Age” premise. Essentially committing to film anything that pops into their minds, co-directors Mike Thurmeier and Galen T. Chu go for broke with “Collision Course,” hoping to charm with silliness instead of endear with established personalities heading in a fresh narrative direction. Read the rest at Blu-ray.com