While on the planet P3R-272, SG-1 comes across an ancient device that downloads a vast amount of knowledge into Jack's brain. Jack has the task of helping Daniel solve ancient mysteries while trying to save himself from braindeath due to the overwhelming stress.

When the SG-1 team stumbles upon the chamber of former Goa'uld enemy Ma'chello, they fall victim to his powerful body-swapping invention. Ma'chello takes on Daniel's body and the young archeologist finds himself trapped in the body of an old and dying man.