Power Rangers RPM/Tear Jerker

"Dr. K: We all do things in life we regret. But if we don't learn from them, and move towards a brighter future, we pay twice.
 * From "Ranger Yellow, Part 2": Andrews sacrificing his life for Summer.
 * From "Ranger Blue": Flynn's father finally acknowledges him as the hero he was meant to be. Also a Crowning Moment of Heartwarming.
 * From "Doctor K": The entire episode, especially Dr. K's flashbacks to her life growing up at Alphabet Soup, counts as one giant tearjerker. Someone please give her a hug.
 * From "Ghosts": Dr. K's reaction to seeing Gem and Gemma for the first time since Venjix attacked Alphabet Soup. (And she smiles, even with tears running down her face.)
 * From "Ancient History": Dr. K's exchange with Colonel Truman in Corinth HQ.

Colonel Truman: I've already paid more than most.

Dr. K: I know. And if I could access the space-time continuum long enough to undo what I did, I would. That's not possible."