Power Records comic book & 45 RPM record sets (and if you don't, go here or here), there was some cheesy charm - especially in those days before home video and the internet - to having new adventures of the Star Trek or Space: 1999 crews available at your fingertips. Sure, the voice actors didn't sound anything like the TV casts, and the stories were juvenile, but hey - it was the 70s. You took what you could get. And the artwork was pretty cool, too, if occasionally strangely inaccurate (Uhura as a blonde Caucasian?).
If you've never experienced the Power Records, um, experience, and you're not sure you want to download any MP3s or PDF files, someone on YouTube has approximated the joys of Power in video form.
So, here's the Power Records adaptation of Space: 1999's "Breakaway" in two parts. Nice art. Enjoy!