New S.U.I.T. recruit Zeb the sheep joins the flock to help crack the greatest mystery of all! But, just what is the greatest mystery of all? Pondering that conundrum is what has kept the dearly departed General Inspectre tethered to Earth long after he should have moved on to the great super-spy base in the sky. Zeb must solve the series' biggest mystery EVER to finish the Inspectre's unfinished business!