Max was a boy who liked to dream. He had a imaginary friend named Alex, a unicorn who went with him on adventures. One day, Max and Alex went on a trip to see the strange cities in the ocean around the world.

As they went across the ocean, they saw lots of wonderful things. They saw colorful fish, playful dolphins, and even a giant octopus. Max liked the underwater world and wanted to see more.

As they got near a city made of coral, Max and Alex were very surprised. The city had curious sea creatures and pretty buildings. Max and Alex looked at everything, and they met friendly sea turtles and shy seahorses.

While exploring, Max and Alex found a group of mermaids. The mermaids sang lovely songs that echoed in the city. Max and Alex danced with the mermaids and even showed them some new moves.