Ickis, Oblina, and Krumm are bored when Gromble's old teacher lectures at the academy. But when they escort him back to the dump, they learn that old monsters are the best monsters. Every boy and monster's worst fear is realised for the Gromble -- his mom shows up at the academy unannounced. The Gromble leaves her in the care of Ickis, Oblina, and Krumm for the afternoon with alarming results.