Oliver and Daniel are unwittingly drawn into a parallel world, from which they can escape only by finding a lost artifact, which is needed to save the strange world from extinction. Oliver, who is only 7 years old, not only has a massive task ahead of him to track down the artifact but also the responsibility for protecting his 4 year old brother, as their adventure unfolds in this strange world.

Oliver & Daniel return to Netherworld, where they were previously responsible for finding a lost artifact, which was needed to save the strange Parallel World from extinction. Now they have another mission. They must return a small boy, who has entered this strange land by mistake, to his own world. They are told that their own existence depends on the success of their mission, but they are not told why. This time they have The Temporal Phase Shift Adjuster to help them with their difficult task, as well as the Portal Opener which they acquired on their previous visit, which enables them to...

Oliver & Daniel return to Netherworld, where they hope to meet up with Tania again and explore Estopia, a strange medieval town which they briefly saw on their last visit. But there is a time difference between the portal they use this time and the one they went through previously. As a result, they arrive just in time to see themselves leave from their last visit and narrowly avoid the embarrasing, and potentially dangerous situation, of meeting themselves. Estopia is being terrorised by an evil man who is robbing the people using an invisibility cloaking device to conceal himself. Returning...