Sack (Strap-on Android Carrying Kit) is Doc Clockâs smart-mouthed robotic backpack. Sack deeply detests being strapped to such a simple-minded inventor and secretly plans to overthrow his bearer and become ruler of the world. Construct an infinite number of inventions from the objects you discover on your journey. Use them to glide, slide, climb, drive, bounce and fly your way through your adventure in an effort to save Franklin the cat from a prickly fate. Instantly undo your crashes, slips, sinkings, miscalculated trajectories. Even if you just went too fast for comfort and want to try it again, you can travel back through time using the Doc's amazing Timeslider.