Some aliens, one of which is a Tamarean, are headed towards Earth with a job from a boss we don't get to see yet... who is probably Lobo... the old one... Anyways, their job? Well, the first part is to hijack Starfire's ship.
No one but Roy is inside the ship by the time the aliens beam down to it. Jason is outside practicing fighting against some holo-projections, and Starfire is just generally enjoying life, flying over the ocean. So while everyone is having a good time, Roy gets abducted by the aliens when they fly off with the ship, but they don't know anyone is inside the ship.
While Jason and Kori try to figure out what the hell just happened, and fighting the fourth alien who was too drunk to be on time and got left behind on Earth, Roy is sneaking around the veneration system in the ship, trying to figure out what the aliens are doing. Turns out the aliens stole the ship to launch these planetary bombs they've got. Inside these bombs are self replicating nanobots which first, wipe out all life on a planet, and second, leave a brand or logo on the planet's surface. Why? Well, seems like whoever hired these alien mercs are prepping planets to be sold, and why wouldn't you want your logo on a planet you just bought?
After fighting off the drunk alien, Jason and Kori get some info out of him, and plan to go into space in an attempt to find the ship and Roy. Kori asks how they're going to get a new ship, suggesting either Batman or the Justice League could help. But, nah! Not Jason's style... He's going to steal one from Frankenstein and SHADE.