When Mario crashes their party, the group must save their friend.
Can be read here: https://www.fanfiction.net/s/13673836/1/Super-Phinio-Koopas
This Super Mario/Phineas and Ferb crossover contains examples of:
- Crossover: This story is a crossover with Super Mario.
- Hero Antagonist: Mario, usually seen as The Hero in his home franchise, are viewed as the antagonist here.
- Swapped Roles: The koopalings are the ones that meet up with the boys while the Mario Bros. are with Doofinshmirtz.
- Opening Shout-Out: While the Koopalings are hanging out in the Flynn-Fletchers' backyard, Candace busts in and is startled to see them, as alternate-universe versions of the Koopalings previously trapped her in a painting that Phineas pained on top of.Candace: ACK! What are the koopas that kidnapped me and trapped me in a painting which Phineas painted a moustache and beard on me in the Title Sequence doing HERE?!"
- Phantom-Zone Picture: Candace gets in a painting by the Koopalings.
- Villain Protagonist: The Koopalings, usually seen as the villains in the Mario Franchise, are viewed as the protagonists here.