SIR Units, short for Standard Information Retrieval Units, are small robots entitled to Irken Invaders to assist them in galactic conquest. They are small and usually 3 feet tall, with silver armor, jet boots, laser eyes, and additional weaponry. The latest version includes an indentation in the eyes, and cup holders. They have extending arms to reach farther objects and have red eyes. It is common for Invaders to modify their SIR Units, according to the missions they will most likely be involved in, or just to the Irken's liking.