Planet of Origin: Jupiter, or its moon Callisto. This is at least the place they claim to come from or where they have been encountered.
Jovians are skinny green translucid skinned humanoids with huge head, wide eyes and no hair apart from their eyebrows. They have potent psychic powers and seem able to survive in outer space without the aid of an apparent space suit. They are generally perceived as peaceful.
Source: Mattel's Major Matt Mason toyline