Foster's Home for Imaginary Friends: Destination Imagination (2008)

Plot

When Frankie vanishes into an enigmatic box, the crew embarks on a wild journey through a fantastical realm filled with quirky characters and vibrant landscapes. As they navigate this imaginative world, they face unexpected challenges and puzzles that test their friendship and creativity. Determined to bring Frankie back, the gang encounters bizarre creatures and surreal environments, each bringing them closer to their goal. Along the way, they discover the true power of imagination and the strength of their bonds, proving that friendship can conquer even the most whimsical of obstacles.