That's the perfect babysitting episode.
Indeed...in that episode, when they were giving that giant alien a lie detector test, they asked him to lie on purpose to see his reaction..when they asked him how he got to earth, he said, "I Walked"...that sent my two boys into hysterics every time they saw that episode, and that giant said "I Walked"....
They were glued to the TV for that episode, and I could get the rest of dinner done, without a peep from them...