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Tear Jerker: Samurai Jack
Near the end of episode L (#50), when X9, now powering down, and dying, asks Jack to take care of Lulu. Cue Jack showing a worried expression at possibly killing a perfectly innocent robot.
Made all the more worse knowing that you, as a viewer, could predict the ending before it transpired. It was only a matter of time before Jack got the drop on X9 and slew him. What makes it worse? That it's a Deconstruction story told from the perspective of a random robotic mook who had a life and an existence up until he was taken out by Jack. A Mook Horror Show done as a tragic noir tale. "Lulu... sweet thing."
Jack's sword doesn't hurt the innocent. Either it saw X9 as guilty, or... it does not recognize machines.
That's the thing, X9 was not innocent, he had killed in anger and on orders before. Lulu was his Morality Pet. But that was not enough to save him...
Jack and Lava Monster features Jack fighting his way through a maze of death only to confront a near-invincible giant lava monster. Then we learn that the lava monster was actually a Viking warrior, imprisoned by Aku in solid stone. He learned to form the stone around him into a monstrous body, and can only be freed to enter Valhalla if defeated by another warrior in honorable combat. Which Jack does, sending the fallen Viking on to eternal rest.
"Jack and the Warrior Woman." Sure, most viewers were certain that Ikra was evil and was going to betray Jack, but that almost made it worse! The audience guessed it, Jack could have guessed it, he really should have known: his loneliness and his compassion were both expertly exploited.
"Jack and the Travelling Creatures". After the whole episode Jack had spent travelling, passing test after test to prove his worth, he finally stands before the real, genuine time portal. There is a guardian in front of it and Jack humbly asks to be allowed to use it and is denied. He sounds so jaded after he realizes that he has to fight yet again.
Jack: "I had hoped that just once, I would not have to battle for my goal, because it is noble and just. But I see that this is impossible."
After the guardian Curb Stomps him, he decides not to kill him after all. "You can't use it yet, Samurai Jack. Not yet... Not yet."
The ending of "Princess and the Bounty Hunters" was particularly heart-wrenching. Princess Mira, an Anti-Villain who actually has a noble reason to claim the bounty on Jack (so that she can free the oppressed people of her country), works hard the entire episode to set up a well-laid trap. In the end, Jack Curb Stomps the bounty hunters, leaving her as the only survivor. When she realizes she can't defeat Jack, she drops her weapon and cries, solemnly accepting that she can never save her people. It's sad to see her so tragically accept this fate. Though he knows he didn't kill her, Jack doesn't even acknowledge her presence or offer to help her. What's especially poignant is that, knowing Jack like we do, he would have gladly helped her. All she had to do was ask! But she's too filled with pride to do so.
"Jack And the Spartans" is full of Tear Jerker moments.
"Your numbers have dwindled. I fear you will not survive another attack..."
"No my king! We will never give up! We WILL FIGHT!!"
"But I must be by your side..."
"No my son, if something happens to me... you will be king".