Timothy worries about everything, from sharks surrounding his house to the raisins (or are they?) in his toast. He hates going out; he hates staying in; he hates books, television, and setting the table; and he won't get a snack before bedtime because who knows what's in the refrigerator. "The worst of all was still ahead. It was time at last to go to bed. Only at night did aliens fly . . . " Finally, one of Tim's fears materializes--aliens come to visit and insist they want to be friends. Tim has such a great imagination that they make him "the full-time ruler of the Galaxy," after which "Tim got to be brave--oh very, very! He got to be extraordinary." Lehman's bright cartoon-style watercolors will have plenty of appeal for children, and although adults may tire of the relentlessly rhyming text, kids will be busy enjoying the results of Tim's excessive "worry warting."