SpongeBob finds the missing half of an ancient medallion believed to be a relic from the lost city of Atlantis. He brings his find to the Bikini Bottom Museum where the other half is on display. The two sides are reunited, and suddenly a magical van appears that beckons to take SpongeBob to the legendary city. Patrick, Sandy, Squidward and Mr. Krabs all join him in the van and head for Atlantis. Each passenger is eager to experience the many riches the city is rumored to contain: Mr. Krabs wants to dive into Atlantis’ gold and jewels, Squidward wants to absorb all of the Atlantean culture, Sandy wants to study the advanced technology, and SpongeBob and Patrick just want to see the city’s most prized possession, The Oldest Living Bubble. Plankton, who has secretly stowed away in the van’s glove compartment, plans to take advantage of Atlantis’ weaponry. When the van finally arrives at the city everyone is greeted by Atlantis’ king himself, Lord Royal Highness, who spares no time in taking the visitors on a tour. Atlantis proves to be even more wonderful than anyone could have imagined. For SpongeBob and Patrick, their most joy-filled moment arrives when they finally get to behold to the Oldest Living Bubble. This moment is quickly ruined however when a flash from Patrick’s camera causes the bubble to burst.