Robot Adept (Apprentice Adept, Book 5)

Proton and Phaze, parallel worlds of science and magic, are ripe with the seeds of revolution. Mach, a brave and sensitive robot from Proton, and his alternate self, magical Bane from Phaze, hold the power to link the two warring systems—or to destroy them entirely! Both are prepared to save their worlds. But neither Mach nor Bane had anticipated the dangers of forbidden love...with members of the opposite realm!