Starman

Starmen are a strange breed of peaceful energy-based individuals.

Physiology
The Starmen seem to be a species made up of energy, as their "true form" is simply a ball of light. They are a peaceful race who find interest in exploring other worlds and observing other life forms.

When a Starman arrives on a world, they can use a simple strand of DNA to create an "environmental suit" by cloning a human body with which they can phsyically interact with other species.

Earth
Not much is known about the history of the Starmen. Whether they originated as energy beings or evolved into such through years of evolution is especially unclear. What is known, however, is that they have frequently explored Earth.

The launch of Voyager II unwittingly attracted on particular Starman to Earth. When his ship crashed, he travelled to a nearby house, and through a lock of hair cloned a body resembling that of a dead man named Scott Hayden. After sending a distress call, forced Scott's widow, Jenny to take him to Arizona where he could rendezvous with his ship.

Over the course of the journey, the Starman struggled to understand Earth's society. He slowly learned to speak English with some help from Jenny, and developed a particular fondness for Dutch Apple Pie. Eventually the Starman began to experience what is known as love, and as a gift, gave Jenny a baby (she was previously infertile and unable to give birth).

With some help from a SETI scientist Jenny and the Starman were finally able to make it to the rendezvous point in Arizona, where a large spaceship came to pick him up, presumably taking him back to his homeworld.