There are some odd reviews from people who seemed to be expecting a British answer to 'Stranger Things' and who didn't even realise this is a kids programme. To be clear: This was aired on CBBC, it is aimed at pre teens. As a kids programme this is great TV, as can be expected from the BBC, its is designed to educate, inform and entertain.
The ideas may not be original, and the acting may be a little naive, but for my 10 year old programmes which introduce ideas around alien life, time travel. And the nature of reality, are very welcome. This is enjoyable, relatable and thought provoking, infinitely better than most of the typically trite offerings on most of the streaming services.