[1][2][3] In the series, Kappatoo travels back in time from the twenty-third century to 1990/92 to swap places with his identical 'time twin' Simon Cashmere, in order to cheat in a futuristic sports contest.
The computer locates an identical time twin called Simon Cashmere, who lives with his parents and sister Lucy in the year 1990.
Kappatoo time travels back to Simon Cashmere's bedroom and explains that the two will change places.
Kappatoo is still struggling to get used to the twentieth century, after blowing up the vacuum cleaner, thinking it is a hostile life form, and being caught stealing £47 worth of pet food from the local supermarket after not knowing how shopping works in this time zone.
On the other hand, Kappatoo does not do well in the local football match against another school, which Simon watches from the future very unhappily.
With some help from the computer and Steve, who coaxes Tracy back to the party, Kappatoo gets the two girls to touch and rewinds time, solving the issue.
Simon's parents arrive, not too happy with a party going on and a giant hole gushing water in the front garden after the washing machine blew a mains pipe, after being used to make fuel for Kappatoo’s wrist band.
Outside the church, Kappatoo sees Tracy with Gregory, a popular boy at their school, whom she asks out on a date.
Kappatoo calls his computer, asking where Simon is as he wants some information about romance for his upcoming date with Tracy.
Two years after the events of the first series, Kappatoo and his computer watch Simon on the histogram and see that he keeps suffering from a recurring nightmare of himself being sucked into the black hole that he accidentally sent himself to at the end of the first season.
While he is relaxing at the local café, Zeta’s, a friend of his rushes in and inform him that Sigmasix has been released from psycho correction and is being returned home.
Kappatoo returns to his dome and his computer advises him that Sigmasix must apologise to him as part of his release, but has serious doubts that the psycho-correction has had any effect.
Sigmasix is then placed into the custody of his aunt, Zeta 8, who agrees to be held responsible for any of his actions; Kappatoo still cannot believe he has changed.
Kappatoo advises that it is wasting its time and goes off to Zeta’s café to revise with Taufour for his upcoming appearance on Ultramatch.
While Kappatoo is at Zeta’s café, Sigmasix appears and wishes him good luck to further keep up the pretense, not knowing that it is all an act.
Kappatoo tells his computer to work out how to get into Zeta’s dome, so that while they are watching Ultramatch at the studio, he can steal the evidence.
Luckily, Kappatoo has just beamed back to Simon's time to fill in for him, seconds before the officers, Zeta and Sigmasix arrive.
The next day, Kappatoo has trouble milking a cow and uses his wrist band to make it talk, but cannot stop it.
Simon quickly comes forward and tells everybody that Lucy is his grandmother and she looks so young because she has undergone a rejuvenation procedure common in Kappatoo’s time; this has sent her a bit crazy.
Unable to take it in, Lucy faints and is helped by the time travel police who, after making sure she is ok, gives Zeta a ticking off for twice now bringing unfounded allegations against Kappatoo.
The computer advises Kappatoo that this is what Zeta wants, before starting to act very strangely and playing random songs.
Simon mulls over what Sigmasix could be doing back in his time and what Zeta's overall plan is, then wonders when it will be safe for Kappatoo to return.
Once the call has ended, the computer turns and asks Zeta if that was what she wanted him to say, implying it is now under her total control.
Simon is about to go on Ultramatch when Kappatoo’s computer arrives and gives him an ear-piece so it can advise him of the answers to the questions.
But in an incredible twist, the computer names not Kappatoo as the master time criminal but Zeta, who in turn tries to brush it all off as lies, but the computer informs the police to check Zeta’s dressing room to find Sigmasix wearing a wrist band designed for time travel, which they do, and he is subsequently arrested.
Back at Kappatoo’s dome, the computer explains that he never had a virus and the whole thing was an act to make Zeta think her plan was working.
The time police inform Kappatoo that unless he is willing to formally bring charges against Zeta and Sigmasix, they will be unable to prosecute them.
Brian gives his speech, but the reporters seem unconvinced; this gets worse when Steve and Lucy pretend to be aliens, when questioned.