Sky-1 is the name given to the physical embodiment of Skynet and appeared as a large bipedal machine. It contained a variety of weaponry built into its body allowing it to combat opponents in addition to holding a portion of Skynet's intelligence.
Superman vs. The Terminator: Death to the Future
In 2032, Superman and a Steel from the future encountered Sky-1 in one of the Terminator production plants where they battled against it. However, despite their super powered nature, Sky-1 had been prepared and made use of synthetic Kryptonite as a weapon against the Man of Steel. Capturing the two, Sky-1 attempted to download information from their minds in order to hasten the creation of the Omega Point and thus allow the machines to dominate the Earth. During the download process, Steel managed to free himself and later Superman where the Kryptonian used his heat vision to destroy Sky-1.