After a surprise friend & family trip to Beverly Hills derails Zach's birthday plans, he is determined to prove he’s old enough to do his own thing – even if it means making new friends with the Equestria Girls, reuniting with The Owl House & Archie’s Weird Mysteries childhood friends, meeting giants, and reuniting his childhood crush Luanne Platter, and confronting an ancient preteen demigoddess whose angst has apocalyptic potential!