President Obama challenges Jamie and Adam to retest the Archimedes Death Ray myth again, while Kari, Grant and Tory take on Hellboy.

For this final hour of the television icon that is MythBusters, the five hosts are reunited for one last hurrah! Deep within M5, Adam Savage, Jamie Hyneman, Kari Byron, Tory Belleci and Grant Imahara join forces once more to together give a suitably epic, enlightening and emotional finale to the best science show on television.