Fan Casting Smartz (2010)

Dr. Albert Einstein, never one to shy away from a thought experiment, accidentally creates a portal to the past in his cluttered Swiss basement lab. Stepping through, he finds himself smack dab in the middle of the Jurassic period, face-to-face with a grumpy but surprisingly articulate T-Rex named Bernardo. Meanwhile, back in the present, Elsa calls in Agent Smith to find her missing husband. Meanwhile, in the prehistoric past, Einstein encounters Time Displacement, a caveman who's developed a taste for the future thanks to a time travel snack mix Einstein accidentally dropped through the portal.