One beautiful summer day, Spike, Rarity, Discord, and Gabby take a vacation at the beach in Maretropolis for two days. However, Rarity was still feeling the jealousy of Gabby after almost sabotaging her relationship with Spike, despite making amends with the female griffon. After Rarity accidentally pushed Gabby and Spike into the ocean at the dock, they were thrown into the perilous underwater journey, but little did Gabby and Spike know that this would be an epic adventure they ever experienced.