Every lightning bolt the Earth has ever seen has done the same thing exactly once — gather, release, vanish. Thunder Propulsion is an engineer's attempt to take that thunderbolt out of Zeus's hand and put it to work: a controlled electrical discharge, generated on demand, amplified through a resonant magnetohydrodynamic core, and fired again, and again, and again. This is the third and final volume of a speculative engineering trilogy that began with a simple question about artificial gravity (Amber Gravity) and grew into a complete architecture for how a vehicle might power itself across atmosphere, vacuum, and ocean alike. Seven organ-named subsystems — Blood, Hands, Eyes, Mouth, Nose, Ears, Stomach — feed a single amplifying core, built from a regenerative aluminum-air electrochemistry and a Marx-generator pulse system the book calls the Amplifier. Thunder Propulsion holds itself to one rule, stated on its first page and never broken: say what is true, say what is uncertain, and never let the second quietly become the first. The book is honest about where it stands — Technology Readiness Level 1 to 2, a design on paper, not a system in flight — and it hands the reader complete thrust calculations, failure modes, and a tiered path from bench test to orbit, rather than a promise. For engineers, space enthusiasts, and anyone who has ever looked at a storm and wondered what it would take to build one on purpose.