A little boy goes looking for items that begin with the letter "m" to put in his sound box, and finds a pair of monkeys that get mad when they are joined by a bevy of mice.
A little boy, dressed as a king, goes looking for things that start with the letter "k" to put in his sound box, and finds a koala, kingbirds, and lots of kittens that have to be stored in a kangaroo's big pocket.
A little girl goes looking for things that start with the letter "g" to put in her sound box, which leads her into the garden where she encounters some goats, grass, geese, grapes, and a goggle-wearing gorilla.
A little girl goes looking for items that start with the letter "d" to put in her sound box, and finds so many dolls she turns her box into a dollhouse, complete with a dining room, dishes, desks, dresses, and other "d" things.