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Yes, yes, I know it sounds similar to "Battle of the Planets", but honestly, I haven't seen Battle of the Planets, mainly because Nick stopped showing I.Z. so I never got the chance. I heard it's about Zim and Dib fighting over Mercury and Mars, though.
This isn't about two people fighting over two planets, though, it's a war between The Almighty Tallest, The I.R.A, Zim, ŁîM, Dib, Tak, The Invaders, pretty much the entire universe.
And yes, this is the sequel to Zim, Alien.
To be written soon.