For the record, alien #1,000 was Leviathan, another power based on the free-floating planets from the Fantasy Flight Games edition (and my personal favorite so far of that grouping). Let's take a look at what Leviathan is all about:
You have the power of Magnitude. As the offensive player, use this power to treat one of your system planets as a ship. Take one of your planets (with one to four of your ships on it) and load it onto the hyperspace gate. The planet itself is worth 10, plus the value of your ships on it. You may not ask for offensive allies. If you win the encounter, the planet moves to your opponent's system (but does not count for him or her). If you lose, your planet and ships go to the warp. You may raise a planet from the warp as you would any of your ships (returning it to your system as an unoccupied colony).