Parents need to know that "Ice Age: Collision Course" is the fifth installment in the popular prehistoric-themed "Ice Age" franchise. It's not necessary for viewers to have seen all of the former films to understand the plot line, but it does help. The violence/peril is less intense than in previous installments but does feature serious natural catastrophes - like a fiery asteroid headed for Earth (and destructive meteors) - as well as egg-stealing birds bent on destruction.