And as is the tradition of the franchise, our (only) favorite saber tooth squirrel Scrat is partly responsible for the doom of all life on Earth when he launches into space and inadvertently hurls a massive asteroid towards the planet. He later lends his voice as Buck's imaginary weasel astronomer Neil deBuck Weasel, comically providing side commentary that makes his participation one of the film's worthy highlights. It's a clever opening inspired by the surprisingly entertaining scientist's 'Cosmos' television program. The fourth sequel opens amusingly enough with the soothing, scholarly voice of famed astrophysicist Neil deGrasse Tyson detailing the universe's creation. Our three main characters voiced by Ray Romano (Manny), John Leguizamo (Sid) and Denis Leary (Diego) venture out on yet another road trip to save themselves from extinction, along with Earth in the process. In fact, I'd go so far as to suggest it's the same plot as its predecessors. Meanwhile, certain aspects of the plot are frankly recycled from previous entries, exposing a bit of laziness. But for large expanses of time, the gags are tastelessly flat - weird visuals about things inserted or coming out of animal's butts and unnecessary albeit very subtle sexual innuendoes - and much of the action humdrum. Admittedly, the movie is not a complete disaster, as some jokes and cultural references manage to tickle the funny bone on occasion, though I can't imagine even young viewers bursting into fits of laughter.

With each successive installment to the 'Ice Age' franchise, the humor that made the first two movies a genuine joy to watch seems to have melted away, and 'Collision Course' is disappointingly skating on thin ice, oblivious that the next entry will likely plummet into frigid, icy-cold waters.

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