Ep 1. Super Watermelon Island / Gem Drill

In the season 4 premiere of Steven Universe, titled "Super Watermelon Island/Gem Drill," Steven and the Crystal Gems embark on a mission to "Super Watermelon Island," a location introduced in a previous episode that is inhabited by sentient watermelons with gem-like seeds.

Upon arriving at the island, the Gems discover that the Watermelon Stevens (as they are called) have been overthrown by a mysterious entity known as the "Gem Mutant," which appears to be a monstrous amalgamation of various corrupted gems. The Gems engage in a fierce battle against the Gem Mutant, but quickly find themselves outmatched. As they struggle to fend off the monster, Steven begins to suspect that there may be more to the situation than meets the eye.

Meanwhile, back on Earth, Peridot and Lapis Lazuli begin work on a massive drill that they believe may be able to reach the center of the planet, where a powerful gem known as the Cluster is situated. The Cluster is a massive geoweapon created by the Gem Homeworld that, if left unchecked, could destroy the entire planet. With the help of Steven's father, Greg, the two set off on a perilous journey to activate the drill and stop the Cluster before it's too late.

As the episode progresses, it becomes clear that the situations on Super Watermelon Island and with the Cluster are more connected than previously thought. As the Gems continue to fight the Gem Mutant, Steven discovers a shocking secret about the Watermelon Stevens that could turn the tide of the battle. And as Peridot and Lapis approach the Cluster, they must overcome obstacles and confront their own fears if they hope to save the planet from destruction.

"Super Watermelon Island/Gem Drill" is a thrilling and action-packed episode of Steven Universe that introduces new obstacles and challenges for the show's beloved characters. With stunning animation and emotional depth, it's a must-see for fans of the series.