Early Japanese anime. I remember coming home from school, oh musta been 1982-3 or so in order to catch them on TV. Brief synopsis: Earth is under attack from INSERT EVIL VILLAIN HERE. A world war II battleship, the Yamato is converted into a space cruiser, including a gigantic "wave motion gun". Captain Avatar (crusty old cap'n), Derek Wildstar (our hero), Nova (hero's love interest) and a cast of others went off into space to fight the evil ones. Each episode would end with a pronouncement of "There are only X days left to save the earth. Will our heroes survive?" (basically a countdown to the end of the season).
There were 3 full TV seasons plus several feature-length movies. The theme song was cool as hell.
I've got some episodes on VHS. Haven't forked out the $$$ for the DVDs yet.
On a hard rock-related note, I picked up some tapes of the animated series "Biker Mice From Mars" on Ebay. Haven't watched any of them yet. The only reason I bought them was that I have the soundtrack on CD, all songs sung by Jeff Scott Soto (Eyes, Yngwie Malmsteen, Takara, Talisman, Axel Rudi Pell).
-Dan