Metroid/Tear Jerker

The Metroid series indeed has its moments of sadness.

"Samus: The X must not escape this station. I must send them all to oblivion. Them, the station... and myself... if I have to."
 * Super Metroid has several, mostly dealing with the Giant Metroid (the adult form of the baby Metroid that imprinted on Samus in Metroid II).
 * The first time we see it, it swoops out of nowhere in Tourian, latches onto Samus, drains almost her entire energy reserve... and then lets go and floats away. As it does so, it lets out several confused sounds, and you realize that its cries mean something very close to "Mommy?"
 * The part that does it is that the Metroid only lets go when Samus' low-health alarm starts beeping. Remember Ridley's assault on the research lab? The last thing the baby Metroid remembers about Samus is Ridley attacking her and setting off her low-health alarm (unless you're a preternaturally good player, but still.)
 * During the final battle with Mother Brain, Samus is nearly killed by its penultimate attack, injured to the point where she can't even stand upright. As Mother Brain prepares to finish her off, the Giant Metroid bursts into the room and grabs it, sucking the life out of it to save its mother. It then settles onto Samus, restoring her health... at which point the Not Quite Dead Mother Brain gets up and attacks, as the metroid takes the blows. Gamers find themselves heartbroken by the death of an alien jellyfish... and relieved when the resulting Mama Bear moment from Samus lets them make Mother Brain pay by blowing its head off of its neck. With a weapon so powerful that Mother Brain's remains crumble to dust before your eyes.
 * In Metroid Fusion, this troper cries when Samus proposes her plan to stop the Government Conspiracy from abusing the X Parasites and the SA-X, by Colony Drop-ing the Biologic Space Labs. With herself still aboard.
 * In Metroid Fusion, this troper cries when Samus proposes her plan to stop the Government Conspiracy from abusing the X Parasites and the SA-X, by Colony Drop-ing the Biologic Space Labs. With herself still aboard.

"...Leading up to the big reveal:"
 * This troper always thought the penultimate conversation with the AI Adam was an even bigger Tear Jerker:


 * Metroid Prime 3: Corruption has one of the greatest ones for this Troper. It's bad enough that you're forced to kill your three fellow bounty hunters, but Rundas' fight is especially bad because of the music that plays. Try to listen to it without a few tears wetting your eyes. I actually never heard the music the first couple of times I fought him, but when I heard the music by itself and then played the battle, I had to pause the game because of how much I was crying. His death was also tragic, as he seemed to regain his senses for a few moments and recognize Samus, but before he says anything he is impaled through his own icicles, crying out in pain, and Dark Samus comes to absorb his body.
 * Also, the 75% ending of Corruption is incredibly sad, with the usual "Samus takes off her helmet" scene, but instead being triumphant, it shows Samus sitting all alone in Skytown, reminiscing about all of the other hunters she was forced to kill, and gazing off into the horizon, looking very wistful and unhappy.
 * Ghor's death is also sad, due to the fact that Samus is shooting away at Dark Samus in a futile attempt to save him.
 * Which leads into Gandrayda's death. Gandrayda staggers back, losing control of her shapeshifting, and eventually settles into Samuss form. When Dark Samus appears, Samus doesn't even try to shoot Dark Samus this time. She knows that there's absolutely nothing she can do to save Gandrayda. All Samus can do is stand there, with a fist clenched in silent fury as Gandrayda dies.
 * Prime 2 has couple in the form of logs, but one always stood out for me; a not-even-logged scan of a female Luminoth dead near a gate. The scan indicates she died of malnutrition, adding the note "She remained at her post even though she was starving to death."
 * The final log of the GFS Tyr always gets this troper. They're damaged but manage a landing, everything's going fine, and then... "INCOMING!! They're closing in fast... I need backup... I need backup!!" Followed by fifteen seconds of horror as an army of Dark Splinters proceed to rip the Marines limb from limb. The true Tear Jerker comes at the end, though; as the log ends, Samus looks out at the crash site, shaking her head at the futility of their deaths, and then kneels next to Captain Exeter's body and closes his eyes through his broken visor.
 * The last moments of Adam Malcovich. I'd sat through the darkest moment of Toy Story 3, but while I'd felt fear, sadness, etc., it didn't pull hard enough. But that last conversation between Samus and Adam... It came close.
 * Or the playable epilogue. You go back through the ship to retrieve an item that "cannot be replaced." It turns out to be Adam's helmet. Samus picks it up, and then reminisces of Adam in the control room watching her as she plans to go to Sector Zero. Adam is like "No! Samus!" with a pained and worried expression on his usually neutral face, and runs off to go to intercept her, leaving his helmet behind. After this, it cuts back to Samus, who then hugs the helmet. Then out of nowhere, it's time for the escape sequence! This is all done with NO monologue either. And the music...
 * Even a boss gets a Tear Jerk moment. After beating the Draygon, she'll drop to the floor and her three children will mournfully bury her. Samus had inadvertantly orphaned three innocent sea creatures. Nice Job Breaking It, Hero.
 * This troper always gets saddened when he remembers the fate of Bryyo, especially the last Science Lord, who realized the damage they had done to their planet and desperately attempted to merge magic and technology and find an heir to keep the newfound technology alive and trying to keep the rest of the planet from dying...then the rest of those who practiced the old ways found him.