What's bad about Wunderland
? It's just the German word for "Wonderland." In Larry Niven's Known Space series, it's the name of the human colony world at Alpha Centauri.
Or are you reading it as a portmanteau of "Wonderland" and "under," since it's underneath LA? I suppose that might be the case, since it's unclear why a show set in LA would have a German title.