About Power Rangers Season 8, Episode 20 : The Omega Project

Joel's younger cousin Simon, a keen astronomer, discovers a large asteroid is on a collision course with Earth and warns Joel of his findings. Olympius, responsible for luring the asteroid towards the planet, attacks Mariner Bay and creates an eclipse of the sun, plunging Earth into darkness. The Rangers use their new Omega Zord fleet in a dangerous bid to destroy the asteroid by planting explosive devices on it's surface and detonating them