A spaceship lands on Sesame Street and pink and orange Martians emerge, exploring the Fix-It Shop where they mistake Maria's computer for something to break. They also destroy a clock that Maria blames on Big Bird, angering him. The Martians hide in Big Bird's nest to hatch an egg, while Big Bird gets blamed and Bob discovers mismatched socks, Oscar leaves Irvine with Micki and Piri for babysitting. Sponsors: T, U, 12