Offers a look at how the impact of a giant asteroid changed the planet and may have caused the extinction of the massive beasts who ruled the planet for millions of years.

Ensign Nell "Sapphi" Zika has been working hard to get past her trauma, but the unnerving pleas for help she's hearing in the Verge and the song she can't get out of her head are making that increasingly difficult. As Zuma's Ghost gears up for a final run at the Boarding Games, their expert hacker is feeling anything but confident. Plus, her chief's robot dog, Doge, is acting weird-a computer problem she can't find an answer to-and the increasing...