Knights of the Periodic Table

Dexter goes medieval! He is Sir Dexter of Labalot, a Knight of the Periodic Table, and he must save the fair Lady DeeDeever from a horrible fate. But unfortunately, Dexter's rival, the evil Sir Mandark, has followed him back to days of olde and is constantly getting in the way. Will the squabbling knights be able to put aside their differences and come to Lady DeeDeever's rescue?