The Proteus was an advanced ship built by the United Global Space Force to search for the Jupiter 2 when nothing was heard from them for many years. It was commanded by Jeb Walker.
The Proteus was infested by Space Spiders and all hands were killed. When the Jupiter 2 discovered the vessel, Major Don West destroyed it because the spider infestation posed an ongoing threat to anyone else who might encounter the ship. Blarp was discovered aboard the Proteus.