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Mariugh and Luigar tell SMG4 that they got the smartest caveman to help him and Toad get home. E. Gugh then appears, only to hit SMG4 with a Rock. Later, they replace the batteries in the remote with new ones and SMG4 and Toad with the cavemen.
The cavemen then interact with their modern counterparts, but have to go because a rip in space time will happen. The cavemen counterparts go back to their time.