Nomad MK-15c: Nomad is from the 1967 Star Trek episode "The Changeling". In the future, 2002 to be exact, Jackson Roykirk builds and launches the "perfect thinking machine" the satellite Nomad into space. Along the way Nomad gets hit by a meteor and then crashes into another satellite named Tan Ru that is from another planet. They merge and combine their primary programs. Nomad's seeking out new life with Tan-Ru's which was to obtain and sterilize soil samples from other planets into the "find and sterilize imperfection". Thankfully, Kirk is able to get Nomad stuck in a logic loop and has it beam out to deep space shortly before he self-destructs.
(Image courtesy of Memory Alpha)