Thnaks for the ideas they worked really well!
Now that my worlds aren't being invaded I feel much safer, however I can't figure out how to build a ship strong enough to overtake theirs.If I build a ship with a lot of lasers it'll get picked off before even making it to their planet, and if I build a fast ship with not as many lasers it will be far to weak, or will get destroyed orbiting my planet while I'm building up an army of them.
Anyone remember how they got passed this mission?
SOS-Literally!
Btw, yes this is a Dread Lords Mission
Simple - Don't use lasers!

Missiles are much more powerful and Mass Drivers are more compact. Since your cargo-fighters are preventing the Dread Lords from invading you, you won't be troubled by the Missiles' or Mass Drivers' high research costs.
Forget that defense nonsense - don't even care to research Starship Defenses, they won't help you. Focus on economy and research, building up your treasury and technological level. When you have enough tech to build fleets that you think can kill a Dread Lord Frigate in one shot, flip over to an industrial regime and begin building these things. Then beat back the Dreads and do whatever your objective was, if your allies haven't done it already. Try to get Eyes of the Universe - it will save space on your ships and will provide you with a fool-proof early-warning and space-reconnaissance system.
Of course, I wish I can open that box and play this campaign... I actually have never played GC2 at all. This post comes from whatever I've come to know during my rather... intense excitement-induced preparation.