After crashing on Earth in a non-Irken ship, Zim's PAK, along with many of his tools, translator, and memories, are damaged. With no prior knowledge as to why he's there, and a malfunctioning PAK that seems to have a mind of its own, he meets Dib and Gaz, two kids left alone after their dad disappears. Can Zim eventually regain his memories, and the real reason behind his arrival?