The Final Test — Dory Perlman

Meet Sheila McCarthy, an ordinary teenager who likes cheeseburgers and Bon Jovi. But it is her love of science that brings her to the laboratory of eccentric inventor Dr. Reit -- and to his latest machine: a transporter into parallel worlds! Sheila accidentally goes through its portal and finds herself in the kingdom of Arren. Somehow Sheila must find her way back home....

THE FINAL TEST
When Mardock, the evil wizard, put a spell on handsome Prince Laric and his courageous warriors, he also invented a magical antidote that could only work during a lunar eclipse. Now, at last, that time is at hand in the enchanted kingdom of Arren. But someone must sneak into the wizard's underground laboratory and seize the magic formula...

That someone is Sheila, but she is being held prisoner in a rat-infested cell! To make matters worse, she has overheard a sinister plan that will destroy forever not only the beautiful unicorns -- but the entire Arren world as well! Only Dr. Reit can save her, the unicorns, and Prince Laric... But will he materialize through the portal soon enough? And will he finally be able to bring Sheila back home?