Alexander, played by Ed Oxenbould, experiences the most horrible day of his young life—a day that begins with gum stuck in his hair.
Dylan Minnette plays Anthony, Alexander’s older brother and a "total winner.”
Steve Carell plays the role of Ben Cooper, Alexander’s dad, who’s hoping to transition from stay-at-home dad to the ranks of the employed.
Celia, played by Bella Thorne, is Anthony’s girlfriend.
Kerris Dorsey plays Alexander’s sister Emily, an aspiring actress who’s looking forward to her debut as Peter Pan in the school play.
Jennifer Garner is Kelly, Alexander’s mom and a force of nature who wants to spend more time with her family.