'''First Season'''
* The death of [[spoiler: Shiori Kazami (Shun's Mother), the first time you see Shun is completely broken into tear after see her deathbed. For unknown reason, this scene is change in English version,and the doctor told to him that ''she just tired''. If you wonder why she never be seen again, here the reason.]]
** In episode 31th, when Shun feel into hallucination of Oberus when he challenge to fight with the young version of Shiori. It become worse when Oberus burn Skyress and Shun start feel into saddened ,admit that he needs his friends to move on, and that each one of his friends are important as ever.By the time Shun realizes this, it is far too late. Skyress has perished and Shun mourns over her loss. As drops of Shun's tears fall on Skyress' Ability Card, resulting Skyress evolve into "Storm Skyress''
* Preyas [[spoiler: getting sent to the Doom Dimension,]] and Marucho's reaction to it. What's worse is that [[spoiler: both Marucho and Preyas knew it might happen, but Preyas chose to go into battle anyway to make sure the deaths of Marucho's other Bakugan (Limulus and Juggernoid) wouldn't be in vain.]] Oh, and when [[spoiler: he comes back, he's gets corrupted by negative energy, and sends several of his former teammate's Bakugan to the very place he was brought back from.
* Dan's reaction to [[spoiler: Masquerade having Hydranoid blast Drago even after he's been defeated. Even worse when Drago is sent to the Doom Dimension.]]
* The death of [[spoiler: Masquerade]] counts, simply for him being so calm and excepting of his fate.
* All the kids having to say goodbye to their Bakugan partners.
* Drago [[spoiler: becoming one with the New Vestroia's core]].

'''Second Season'''
* [[spoiler: Skyress leaving Shun, for the last time. After Shun's been busting his ass to save her.]]
* The entire scene of episode 18th, where Spectra abuse Drago and he start crying tears of suffering.
* Mira's cry for her father is heart-wrenching as the Alternative explodes [[spoiler: with her and Keith's father inside.]]

'''Third Season'''
* The flashback of episode 26th where[[spoiler: Kazarina against Jin who no other is Fabia's fiance, which resulting his death and Aranaut is captured. It believe that Aranaut suffer amnesic after being tortured by Kazarina,However, Aranaut was actually lying on Fabia's behalf due to the sadness she felt when he died.]]And the end of Ren battle with Fabia, after he realized he unable to avenge Sid's death, Ren fell into TearsOfRemorse and Fabia accept his redemption when he finally got his HeelFaceTurn to Gundalia side

'''Fourth Season'''
* The deaths of [[spoiler: Anubias and Sellon]] were surprsingly tear inducing despite the fact that the pair showed almost zero redeeming qualities. While [[spoiler:Anubias]] was by far the more sympathetic of the pair, watching [[spoiler:Sellon]] plead to live ''just'' long enough to see the ''perfect world'' her master planned to create was a very KickTheDog moment for Mag Mel.
* After not seeing many of these Bakugan for years, it was great to see Preyas, Elfin, Tigrerra and the like again. What was ''not'' so great was watching them all [[spoiler:being slaughtered]] while trying to defend New Vestroia. It was all pretty horrible, but the deaths of [[spoiler:Elfin, Amazon, Preyas and Tigrerra were probably the biggest tearjerkers.]]