In casting "Good Morning, Miss Bliss", Peter Engel knew the success of the show would not hinge on Miss Bliss herself, but on her students. Engel particularly envisioned one character, Zack Morris, who "would be that incorrigible kid who could lie to your face, letting you know very well that he's lying, and make you love him for it all the same." Engel insisted that the show could not go on without Zack Morris, but he turned out to be one of the most difficult characters to cast. Engel's casting director, Shana Landsburg, finally happened across fourteen-year old Mark-Paul Gosselaar and was immediately struck by the teen's charisma, charm, and good looks. After a quick read-through, Gosselaar was immediately given the role.