Vicky Van Varbles, AKA Lin's nemesis, AKA the most annoying person on the planet, has discovered the microterium! Lin is convinced that this is the Worst. Thing. EVER! Vicky has never kept a secret in her life. The only solution is to trap her in a bug jar for the rest of eternity. But Danny has a different plan...if they can induct Vicky into the (newly created) International Microsaur Protection Agency, he's sure she can be convinced to keep their...

Forming a plan to render themselves the best Microsaur sitters ever, Danny and Lin are unexpectedly challenged by a pair of rampaging T-rex twins whose antics complicate a race against time to fix the Professor's wrecked lab before they are kicked out of the Microterium.