When Ella heads out to collect space materials for the Clubhouse, she borrows Slippy's luckiest good luck charm, Mooncake. When Ella arrives at a black hole, Mooncake is bumped into its strong gravity.

Slippy needs iron to fix his spaceracer, so Ella tows him to a metal asteroid, where Glitch is instructed to cut off a small piece. But when Ella distracts him, he accidentally cuts the asteroid into two large pieces.

The gang is playing at the clubhouse when a silicon rocket goes missing, they decide to look in the atmosphere of Jupiter, where Ella can explore its Great Red Spot while Slippy looks for the elusive jellyfish.

Ella finds the missing wheel of the Lunokhod 1, a Robotic Moon Rover featured in Dad's new Lunar Exploration Museum. When they power it up, the Rover races across the moon's surface with Ella, Slippy and Madhu in hot pursuit.

After an exciting race, Ella's dad gives her a mysterious treasure map of their solar system. It was Slippy's dad who had given it to him when they were boys.

Ella's family are packing for their Annual Flare Star Day when Madhu shows up, urgently asking for Ella's help.