Part Four of the four-part series! Deep in space, Aurora, Monica, and Kalen desperately work to repair Aurora’s ship for a critical rescue mission. Balthazar, an ancient alien of mysterious origin, watches as his mammoth Ark speeds towards an unstoppable collision with Earth. Scott, Kristine and Gus prepare a high-tech defense of Vanguard, knowing that they face either defeat at the hands of a mechanized Brut’hara, or annihilation from outer space!