It's another scary day at the Black Lagoon. . . . Mrs. Green tells her students that they're going to have a class pet! Hubie's imagination goes wild. Will the new class pet have fangs, horns, or headlights? Will it be vicious? Who knows what kind of monster Mrs. Green will bring in?Hubie's worst fears are nearly realized, when Mrs. Green brings in a big cage. What could be inside?