What if the Solar System had not one but two Jupiter-mass gas giants orbiting between Mars and Saturn — one at 3 AU and one at 4 AU? With different orbital periods they lap each other every few years, sending repeated gravitational shocks through the asteroid belt and the terrestrial planets. Mercury, Venus, Earth, and Mars start in their real 1 January 2025 positions alongside the real Saturn, Uranus, and Neptune; the original Jupiter is removed and replaced by this pair of twin giants. Multi-giant systems are common elsewhere — HR 8799 hosts four — but our Solar System's single dominant Jupiter may have been key to Earth's habitability by clearing debris and limiting impacts.