There are many ways to look at disabilities. Ivan the INVACAR is a car that transports his driver Derry, who uses a wheelchair. So, Ivan is an adaptive device to help people with disabilities. However, Ivan is also a reluctant superhero who helps those in need: In this fourth of many adventures, Ivan, using his superpowers and along with his friend, Big Dog, rescue Wobbly Hubcap and returns him to his home on Mable the Morris Minor.