each episode seems to be the same, still good though
it seems that each episode is the boys discover something to do, the platypus goes on a mission only to be caught by the doctor, the sister tries to get the boys caught in the act by their parents but always fails, the platypus escapes and stops the evil doctor, the boys' end their shenanigans and return to normal right when the sister gets their parents to see what they are doing, with the platypus showing up, then the silent one says something.