The O'Brien family are new in town. An ordinary family - well, almost. Roy O' Brien is a little different - he's a cartoon! In science class, Miss Sheringham is reluctant to dissect two frogs. Sinead and Roy are also horrified by the prospect. Together they confront Mr Hammond and plea for the frogs' pardon, but to no avail. Mr. Hammond offers to perform the procedure himself. Roy has a cunning plan, not only will he save the frogs, he will also impress Sinead. However, his plan of keeping the frogs as pets does not go down well with Maura.