With an eccentric father forever concocting something weird and wonderful in the garage, it is no wonder that young Felix has such a vivid imagination. And yet, his refusal to wear anything but a tiger costume, and his preference for the company of his "talking" stuffed animals over that of other kids, is starting to worry his mom. Meanwhile, on the other side of town, a millionaire leaves the lion's share of his fortune to his beloved dog Sergeant Pepper, raising the ire of his two kids. If they manage to kill Sergeant Pepper, they inherit everything. Running for his life, Sergeant Pepper ends up in Felix's backyard, and a beautiful friendship is born. When Felix's mom discovers that he is harboring a fugitive dog - who Felix claims talks - she decides things have gone far enough.