When you Special Summon "Alien Dog" by its own effect, it automatically generates the 2 A-Counters needed to Special Summon this card, making the ability to swarm your opponent quite simple.
Keep in mind that there are no summoning restrictions on this card, it merely provides a means of special summoning itself. Useful if you have control of an opponent's monster for a short period, as is common with alien decks.
Use this card with "Code A Ancient Ruins"; "Alien Overlord's" own effect ensures that you will always be able to summon, and it pays for itself when revived from the Graveyard.
Use the spell card "Star Blast", pay 1000 life points to reduce this monsters level to 4. This way, you can summon it without tributing monsters or using the effect of "Alien Dog".