Throughout the series there have been several emotional scenes inserted in certain episodes, such as:
- I, Monster when Master Splinter was mind controlled to fight his sons
- Showdown (season 1 finale) when Raph called out Leonardo name thinking he was going to sarifice himself
- The Mutation Situation when Kirby shielded April from the falling mutagen only to have himself mutated
- Mutagen Man Unleashed when Mutagen Man drank the chemical and became frozen
- Slash and Destroy when Raph witnessed his brothers being beaten up by Slash
- Metalhead Rewired when Metalhead sarificed himself to allow the rest to escape
- The Manhattan Project when Master Splinter was poisoned and forced to fight Shredder in front of Leo
- The Wrath of Tiger Claw when Karai realized her true identity
- Vengeance is Mine - pretty much the entire episode, most notably Karai's mutation
- The Invasion - again pretty much the entire episode but most notably Leo's beatdown
- Within the Woods - Raph's care for Leo
- Vision Quest when Splinter's spirit appeared over the campfire
- Return To New York when the turtles found feral Splinter who couldn't recognize anyone
- The Pig and the Rhino when Karai decided to say goodbye
- Tale of the Yokai when Tang Shen sacrificed herself to defend Yoshi
Which of those made you really sad (choose your top 5 if you are polling)?
For me,
Vengeance is Mine is the only episode that made me shed tears so far, but I also felt
Showdown,
Metalhead Rewired,
The Invasion and
Tale of the Yokai really touching