YMMV / Ultraman Cosmos 2: The Blue Planet

• Complete Monster: Sandros ("Variant Lifeform") is a ruthless space monster and leader of the Scorpis. Desiring to reduce the universe to a desert wasteland to better suit his liking, Sandros would begin a genocidal rampage across the stars, destroying multiple planets including Juran and Gyas. When the few surviving Alien Gyas manage to escape, he sends his legions after the defenseless fleeing ships to complete his genocide. Trailing the sole surviving ship to Earth, Sandros launches a full scale invasion with the intent of destroying the planet as he had others. When a last ditch shield prevents his army from making land fall, he forces his army to turn themselves into suicide bombers to breach it. When his forces are beaten into retreat, Sandros finishes the survivors off himself for their failure. Immobilizing Cosmos, Sandros would mock the hero before attacking him while he's defenseless, then laugh sadistically as he brutally attacks the hero and Justice with his arm blades. Even in death, Sandros's evil is such that it would convince Justice to attempt to aid in humanity's destruction when the mere thought of them turning out as vile as the space monster becomes possible. Among the often sympathetic and redeemable enemies Cosmos faces, Sandros stands out as an unrepentant mass murderer.
• Tearjerker: The scene where Musashi finds out Planet Juran, which he fought to defend in the series proper, is now a wasteland with its guardian Parastan dead is pretty depressing.