Ivan's Appeal
 Whilst on a family cruise in the Antarctic, Jo and Colin meet an iceberg called Ivan. He is slowly melting and pleads with the children to help him before it's too late. Their father makes a videotape recording of Ivan and the problems faced by himself and the glaciers which is then aired on Blue Peter. This initiates a nationwide contest amongst schools to devise better environmental ways, and the prize is to visit the Antarctic to find Ivan. Thanks to a host of clever ideas from the children and an enlighted head teacher, Jo and Colin's school wins a place on the amazing sea voyage. They manage to locate Ivan, who is pretty ill, in time to tell him that his appeal has not been in vain.