- "You see, when they stole Mr. Fluffleupagus, they stole the heart of the first grade."
– Sammy talking about Heinrich
The First Graders is the students in the first grade at Gallagher Elementary School. They have a pet rabbit named Mr. Fluffleupagus and the first grade president is Sammy.
History[]
Heinrich Von Marzipan found out about a Chocolate Volcano on the other side of the Jungle Gym, and stole the first graders pet rabbit, for which he gave them a single piece of peppermint candy. He also took with him the first grader Jessica, to show him the way to the volcano. With their pet rabbit stolen, the first graders lost all hope. Their water fountains dried out, their crayons broke, their milk turned sour, the hallways filled with sand and dust, they clothes turned to rags and the windows broke. But in Arts and Crafts, one student predicted that two heroes would save them. Numbuh 2 and Numbuh 5 randomly walked by the same day, and accepted the quest to save Mr. Fluffleupagus. Once they returned with the rabbit, the first graders returned to their cheerful life once again (Operation: R.A.B.B.I.T.).
Numbuh 4 challenged a group of first graders to play dodgeball. After defeating them, they told him to go play with someone his own size, which led him to go challenge the Kindergarteners (Operation: D.O.D.G.E.B.A.L.L.).
After the Delightful Children From Down the Lane tricked their way into becoming fourth grade presidents, they pressured the other grades to join them in their attack on Hendry Middle School. Sammy reluctantly agreed, as they had no other choice, and they took part in the assault (Operation: E.L.E.C.T.I.O.N.S.).