As the Thundercats relax outside the Tower of Omens, Lion-O thinks the Book of Omens is tech rather than magic. He attempts to power it up, and is zapped and meets Jaga's essence inside. He travels back in time in the form of his ancestor named Leo to find out what happened generations ago.

Cast: Will Friedle, Corey Burton, Robin Atkin Downes, Satomi Koorogi, Matthew Mercer, Rob Paulsen, Kevin Michael Richardson, Cree Summer