As a Moments subpage, all spoilers are unmarked as per policy. You Have Been Warned.
- Magister Labrid's death in the pilot.
- The ending of "Max Out", with Max's apparent death in the line of duty.
- At the end of "Alone Together", Reinrassic III choosing to stay on the planet rather than just come back home with Ben, because the friendship he's formed with Ben means that he has failed as a Highbreed. He gets better, fortunately.
- The ending of "Voided", where Max is revealed to be alive and he and Ben reunite briefly, but Max is still unable to return to Earth yet.
- The ending of "In Charm's Way". Kevin spends the entire episode being a Jerkass to Gwen, believing that she hasn't even been trying to find a way to fix his most recent mutation after the failed attempt to hack the Omnitrix. Ben finally has enough and calls him out hard, not only informing him that Gwen has in fact been spending every spare moment since the accident occurred trying to find a cure for him, but also calling him out for automatically assuming that Gwen wasn't trying to help him in the first place. The look on Kevin's face says it all.Kevin: Where's Gwen?
Ben: Went home. You hurt her pretty bad.
Kevin: I hurt her? I'm the one that looks like this, and she hasn't doesn't a thing about it!
Ben: You are a giant rock-faced jerk!
Kevin: Yeah, whatever.
Ben: Not "whatever". She's spending every spare moment going through every magic book she can find to try and help you! She's been doing it since the accident.
Kevin: She... she never told me.
Ben: Should she have had to? - Ben's Heroic Sacrifice in "Time Heals".