Entrèe's lucky stone goes missing and Peri is determined to find out who took it.

After their friends laugh at them for crying monster, Peri and Entrèe try to make a monster of a cute little mutant called Melvin.

Peri and Entrèe find a remote that can control a local volcano. However, their playing with the remote drains the volcano of lava and leads to problems.

After experiencing painful itching, Peri becomes a chrysalis, emerging to reveal a beautiful pair of butterfly wings, which entrance anyone who looks at them. Entree takes advantage of this by charging the other mutants food to look at Peri's wings. Mister Smarty Smarts tells Peri that Entree is using him, convinces him to banish Entree, and starts using him for his own nefarious goals.

When Peri and Entree fall in love with a pancake, they start to fight each other over it.

Peri is feeling under the weather and his refusal to stay in bed leads to problems for everyone around him when his illness worsens.