Raumpatrouille Orion (aka Space Patrol)
A fantastic German scifi series from the mid 1960s. Commander McLane and the crew of the fast space cruiser Orion patrol Earth's outposts and colonies in space and defend humanity from the alien 'Frogs'. This series had very good special effects, groovy 60s music, haircuts, and dancing, and a fantastic space war against unknown alien forces. What more could you want?
Warning: The DVD that I link to is a European format (aka Non-USA).