10-year-old Stanley Crumb has captured a tadpole from Ravenville's infamous pond, the Black Lagoon. Poor Stanley had no idea the tadpole would grow into a creature so big; his fish tank can no longer contain it. Is it because Stanley overfed the poor thing? Things go from bad to worse when Stanley leaves the creature unattended overnight and he floods the basement. Brady and Virgil run to the rescue, but taming this beast is no easy task. Meanwhile, the snoopy Game Warden is obsessed with catching the Crumb family red-handed interfering with the local wildlife. Brady has a plan to catch the monster, as he wants to reunite the creature with its better half. To be a monster catcher, you sometimes have to be a monster matchmaker. Unlucky for Virgil, Brady has picked him to be the bait...