A girl is arrested after trespassing on the land surrounding the huge medical centre where she is kept captive under maximum security. Mark and Song Li learn that the girl is an extra-terrestrial who wants to return home. Her ship lost fuel during their journey through space, and they landed on Earth to collect their fuel, which is water. They wanted to land in the ocean, but they accidentally landed near the medical centre. The girl (Lex) wants to go back to the ship to go back to her home town. So Mark and Song Li try to help her escape.

A man goes missing in a small village and it is believed that he was abducted by aliens because of bright lights that appeared where the man was walking to. Everyone in the village saw the lights except the Cargills, a strange family who were staying in the town for only a few days. Could they have anything to do with the alien abduction or will it all be a made-up story?

A teenage boy (Ian) is afraid of heights, but when he believes that he has a guardian angel, Mark is sent to investigate. But Song Li and Mary discover that people who see their guardian angels have their guardians fade away after a while. And in a dangerous attempt to fight his fear of heights, Ian's guardian fades away, and Mark must help him get across a pole high in the air without his guardian.

Mark and Mary go to a farm where a plane mysteriously went out of contact for a while and then came back in contact later on. While out in the yard, the farm's owner, Neil Goodson, digs up a rock and the five people on the farm are sent back in time to when Mark and Mary were invited into the house. Mark and the owner's daughter, Becky, notice the time loop, and if they don't stop the loop in time, time could destroy everyone on the farm.

Mark becomes one of the first people to try out a new machine called the Future Box, which tells his possible future. He is told not to meddle with the future because he will end up stuck there if he wants to stay there forever. Unfortunately, he makes contact with his older self and gets stuck in the future, and unable to get out because of his longing to stay. Outside of the future, Song Li, Mary, Prof. Powers and Prof. Dixon discover that Mark is going through troubles because his pulse is going out of control. Song Li must get into Mark's future to stop the future from crashing down and destroying the younger Mark.

It's Mark's birthday and to celebrate it, Mark, Song Li, Mary and the Professor go to a soccer ground where an FA cup was won and where the cup still stays. Tyrone Lewis is a boy can tell the future and he senses that Mark and Song Li will steal the cup. But Mark and Song Li aren't going to steal the cup. Someone else is, and to find out, Tyrone must change the future that he sensed.