More information about Parallel 9 can be found at
Paul Morris' website. Here's an excerpt:
QUOTE
Parallel 9 began in April 1992. The premise of the show was that Mercator, an old alien prince with very long eyebrows, had been banished to Parallel 9 because of his thirst for knowledge when knowledge was banned on his home planet. He was allowed to be awake for only 2 hours a week - 9:00-11:00 a.m. on Saturdays - when he could ‘beam up’ guests to Parallel 9. With him lived Calendular - an earth girl who he had somehow called permanently to P9 against her will - and three other criminals banished from their home planet; Steyl, Skyn and Thynkso (I have no idea why they decided on such strange spellings), who spent the best part of each week trying to escape from Parallel 9.
Each week kids, celebrities and whoever else was prominent at the time could be ‘beamed up’ to Parallel 9 to be interviewed and each week two kids would receive a backwards watch (as time was supposed to go backwards in P9) and tickets to a Michael Jackson concert which, for some reason, were presented to them inside a strange stick. There was a computer games challenge each week where a celeb and a kid would battle against each other on a new computer game while reviewing it. Mercator would also put knowledge in the ‘Tope’ - which I guess was a kind of lake with a big glass thing in it! The set was supposed to represent outer space but on reflection it is rather reminiscent of the back drop to the National Lottery show.
In other words, this was something like a children's version of Saturday Night Live, with celebrity guests coming on to perform in skits when they had a project to promote. Sid appeared, along with other promotional appearances, to promote the launch of DS9 in England.