Plasma Life Forms - Aliens from a Parallel Earth
According to plasma metaphysics (Jay Alfred, Our Invisible Bodies, 2006), the physical-dense Earth is gravitationally coupled to a counterpart dark matter Earth composed of low density plasma. This "sister" Earth was co-accreted with the physical-dense Earth about 4.6 billion years ago from dark matter components in the embryonic Solar System. Plasma life forms evolved on this counterpart Earth, just like it did on the visible planet. These life forms were as varied in scale, structure and intelligence as carbon-based life forms - as different as a microbe from a whale; a mosquito from a tiger; a giraffe from a crocodile; an ant from a human being. Their degrees of intelligence and awareness were as different as a centipede's awareness to the awareness and intelligence of homo sapiens. Homo sapiens evolved carbon-based bodies that formed symbiotic relationships with some of these plasma life forms (indicating a type of symbio-genesis). Some of these plasma life forms have interacted with us in the past (intentionally or unintentionally).
I've read weirder ideas.