Gum stuck in his hair signals the start of a disastrous day for 11-year-old Alexander (Ed Oxenbould). One calamity follows another, but when Alexander tells his family about his misadventures, he finds little sympathy. Alexander begins to wonder if bad things happen only to him, but he soon learns that he's not alone when his mother (Jennifer Garner), father (Steve Carell), brother (Dylan Minnette) and sister (Kerris Dorsey) all find themselves living through their own calamitous days.