With the Wicked Witch of the West now vanquished from Oz, Tom and Jerry along with Dorothy are back in Kansas! But not for long as an all-new villain has surfaced from beneath the magical land, the Gnome King! Having captured the Good Witch, the Gnome King and his army are wreaking havoc throughout Oz and need but one item to take control of The Emerald City, Dorothy's ruby slippers! It's up to our favorite cat and mouse duo to team up, go Back to Oz and save the land they love. Take to the skies, courtesy of the Wizard himself, with Dorothy, Toto, the Scarecrow, the Tin Man and the Lion as they make their magical journey. The laughs and adventure will roar as they encounter all-new frights and mischievous creatures down the Yellow Brick Road, 'cause "we're not in Kansas anymore!"

Achilles, a normal man infected with a disease that will bring down the Erebus rulers (human/machine hybrids) escapes back in time from 2410 to the present day where he has a chance to stop the Erebus from ever rising to power. However he is followed by the Erebus-7 who will stop at nothing to hunt him down.