Parent Teacher Night / Walk of Doom

S1, E3: It's parent/teacher night and Dib warns Zim that if he doesn't show up with real human parents, everyone will know he's an alien. The closest thing Zim has to a mother and father are the barely functional Robo-parents. Zim formulates a plan to program the Robo-parents with a disc called "Proper Earth Parenting." / Zim and Gir learn that getting home in the big city proves to be more than difficult when they get lost during a test of Gir's newly repaired guidance system.