After the long winter vacation, Humphrey can't wait to see his friends in Room 26 again and find out what Mrs. Brisbane has planned for the class. But he's shocked by a big surprise on the first day back -- a new class pet!
Humphrey offers his paw in friendship, but Og the frog doesn't seem interested. Plus, the students are so interested in Og, they almost stop paying attention to Humphrey altogether. Humphrey doesn't like the MAD-BAD-SAD feelings he's had since Og came, but luckily he still gets to go home with different kids on the weekends. He loves helping Lower-Your-Voice-A.J. deal with a bully, Golden-Miranda get along with her new stepsister, a new student feel like she belongs, and more.
Friendship can be a tricky business, but if any hamster can become buddies with a frog, Humphrey will find a way!