Ollie the Bunny is having a special party in Wonderland but he forgot to invite the guests. It's up to the Wonder Pets to track down the Mad Hatter, the Cheshire Cat and the Queen of Hearts and invite them to the party. But the Mad Hatter wants the Wonder Pets to try on a variety of hats before he'll listen to their invitation, the Cheshire Cat keeps disappearing and the haughty Queen of Hearts refuses to go! It's going to take a lot of teamwork to get the party started.