The four animal friends - Albert the lion, Brad the giraffe, Chris the hippopotamus, and Dan the zebra - go on an adventure to ride the MRT in Singapore. However, they discover only those under 160cm ride for free. By measuring their heights, they determine that Brad at 300cm and Dan at 180cm must pay. Since they cannot afford two fares, they stack on top of each other to pay for only one ticket and enjoy their MRT ride together.