Perry Rhodan is something I discovered in musty, dusty secondhand bookshops around London. I found a huge stack of these for about 40p each, bought a few and haven't been able to find them again. These were printed in the 70's and I absolutely love the cover artwork even if they have nothing to do with the books plot. The artist behind this particular one is Peter Andrew Jones and the others you see below are done by Angus McKie. Between the two Britsh born artist, they've produced more paintings than you have had hot meals. Except for you Matt Ash, you've had a lot of hot meals.
As for Perry Rhodan, well, the never ending series of books, comics and spin-offs follow the adventures of (you guessed it) Perry Rhodan. A Buck Rogers styled, space-adventure type guy who's adventures are very, very,very numerous (2450 episodes to be exact). Apparently its the best selling science fiction book series ever. For starters, in your face Star Trek, but secondly, why haven't I heard of it? I think it might have something to do with the age of it, teetering toward the 50 year mark now and probably well past it's hey day. Also, Perry Rhodan seems to be a very international series, translated into everything from Russian, to Korean to Klingon. But I think, it's mainly because it's a little bit weird.