It is the thirty-ninth episode in the series.
When a witch casts a spell that turns all of the villagers of Jollywood into frogs, the 7D must hop into action and track down the witch to reverse the spell.
Lord Starchbottom is performing what it seems like a medical operation, only to reveal that he's putting the final touches on a giant cake. A party is held tonight at Queen Delightful's castle, and the Queen wants to make it special for her dear friend, Princess Prettyhead, who's graduating out of Hoity-Toity Tech. Going over the preparations together, Starchy informs Delightful that he will play the violin since one of the musicians is sick. As he plays the violin, he suddenly disappears, and Delightful hears a ribbit, knowing that violins don't make that sound. Then, Delightful, Squire Peckington and Sir Yipsalot are all saying "Ribbit." They all are now frogs!
All citizens of Jollywood become frogs, including the the 7D, and as usual they suspected it's the work of the Glooms, so they set out to their home. But they find Hildy and Grim to be the victims of the mysterious frog spell, too. The 7D then learn the spell can be broken by the witch who casts it with a kiss. They went to the home of the Gingerbread Witch, and she wants to kiss Grumpy. However, the spell didn't break, and the Gingerbread Witch then refers to the 7D two other witches who could break the spell (and telling Hansel and Gretel to stop by at her house if they see them).
The 7D later see the Water Witch and Snow Witch (both also want to kiss Grumpy); still the spell isn't broken. Finally at the swamp, they encounter a Frog Witch and Grumpy, expecting to be the first once more, volunteers to kiss her. The Frog Witch transforms to no other than Princess Prettyhead herself. She then brought them to the castle where she kisses the 7D, Delightful, Sir Yipsalot, Squire Peckington, and Starchy, and the people of Jollywood to break the spell; and the party at the castle goes on. In the end, it's revealed that Hildy is the one responsible for the whole ordeal all this time because she feels that Prettyhead has a much prettier head than she does, but she casts the spell the wrong way—and the Glooms are still frogs.