Pinkie Pie's a big fan of Japanese giant monster movies. Even the cheesy, old ones. Especially the cheesy, old ones.
She's enough of a fan that one day, she decides to make her *own* giant monster movie, in tribute to the weird and wonderful stories of giant atomic lizards, aliens, and robots smashing cities and fighting each other.
Rainbow Dash thinks it's an awesome idea, and soon ropes in other people to help make "Pinkzilla" a reality.
(An affectionate tribute to the goofier side of Godzilla movies, classic Ultraman, and more. Inspired by, but not a sequel to, Tumbleweed's delightful story "GARGANTULON VS. THE SPACE DRACULAS".)