OK, my German is crap but I enjoyed the episode regardless. Wunderbar! And a little research shows the Perry Rhodan universe is fairly well known https://en.wikipedia.org/wiki/Perry_Rhodan (even George Lucas was apparently influenced by the Spaceship designs).
OK, seriously, you can see more in the earlier post I linked to above, where you’ll find more background on Perry, as well as the animator, Raimund Peter, both generously provided by Thorsten Frank, who I thank once again for his German perspective.
And I repeat what I said there: these are fan-made, not professional productions, making them all the more impressive. IMO.