I downloaded the episodes as they were premiering in the UK, at the recommendation of a friend. I was expecting something akin to Doctor Who, with slightly more mature themes. To be totally honest, I was rather shocked by how much more 'mature' the themes were. There's much sexual references, (the second episode being about an alien who feeds off of 'orgasmic energy,' with pretty graphic sex scenes and all) and the amount of nasty gore. The male lead is bisexual, and a very blatant one at that, if you have issues with such things, then this show is DEFINITELY not for your teenagers. There is much casual homosexual/bisexual behaviour occurring throughout the series. As a teenager myself, I only had the stomach to get through about the fifth episode before I had no desire to watch any more of it. If your child enjoys this show, I would recommend they go back to it's family-friendly predecessor Doctor Who. There's a reason it's been airing since the early '60s. I found nothing redeeming about the entire show, the plots were relatively simple and not very thought-provoking, generally, I had them figured out about 20 minutes into it. This show is basically Doctor Who's sexed-up, stupefied cousin with acne.