Steven and Timmy are teenagers following in Grandpa Oliver's footsteps as they embark on a journey traversing Earth, other dimensions, and galaxies--collaborating with fellow beings toward the common goal of unity with Source. With the threat of the Casim, invaders who can cloak and shape-shift, looming since their arrival on Earth over a century ago, the battle for humanity's future intensifies. But now, with the support of the Galactic Coalition, the fight is on, and Earth's defenders are ready to stand united against the ultimate threat.