Mushrooms told me a story that they were once like us, humanoid. They advanced their technology to a point to where they could coil the entire evolution of their species into an organic container we call a "spore". They did this by decoding their own DNA. Now their technology, being as advanced as it was, couldn't save their planet from the inevitable dying of their sun.
So this species decided to seed the Universe with the spores of their race. Spores which are capable of surviving the harshness of space, land on barren planets (or not barren) evolve to the environment (or evolve the environment around them) and begin the long evolutionary process of becoming conscious humanoid entities again.
