Whilst clearing the old barn, Elsie, Adam and their friends, Tom and Sarah, discover one of their grandfather’s old inventions. Powered by lemon juice, the machine transports the kids into the dream world of the child who pulls the switch. One by one, the kids, the family dog and Dad lead each other on exciting adventures of the imagination. They travel into Space, float on marshmallow clouds that rain bubblegum, play in a high-tech treehouse, meet a medieval knight and dragon and almost end up in the doghouse! Thank goodness for the magic yo-yo.