Heartwarming / Ben 10: Ultimate Alien

• At the end of the first episode, Ben is about to enter school, fully aware everybody now knows of his secret identity. As he is approaching, he talks with Julie and expresses concern that everybody probably hates him. Julie's answer? She kisses him on the cheek before saying "Not everybody".
  • Also, two of Ben's childhood bullies are the first to applaud him after they find out his secret identity.
• At the end of the last episode of the series before the credits, it says "In Memory of Dwayne McDuffie".
  • Also, Azmuth giving Ben the new Omnitrix to replace the Ultimatrix;
    Ben: But, Azmuth, I thought I proved I was worthy.
    Azmuth: As usual, you don't understand. You have proved your worth. But this inferior copy of my Omnitrix isn't worthy of you.
    Ben: But-
    Azmuth: OH FOR THE LOVE OF-! Look at your wrist.
    (Ben pulls back his sleeve to reveal a new updated Omnitrix)
    Ben: An Omnitrix?
    Azmuth: The Omnitrix. An improved version I've been working on, ever since you were given the prototype six years ago.
    Ben: I don't know how to thank you.
    Azmuth: Keep doing the right thing.
    Ben: I don't suppose you'd consider giving me the Master Control.
    Azmuth: (smirks) Perhaps for your 18th birthday.
• Charmcaster's Heel–Face Turn and friendship with Gwen in "Where the Magic Happens," especially when she tells the guy who wiped out her magic-using species that "you can't get rid of all of us", referring to her people. As she says this, she smiles at Gwen and holds her hand, showing that she's accepted her one-time enemy as basically a sort of sister.
• Ben telling Kevin he's like the older brother he never had growing up, and Kevin reciprocating by admitting that Ben and Gwen changed his life.
• This, from "Andreas' Fault," after Argit manipulates the trusting Andreas into a Heroic Sacrifice:
  Argit: (clawing at the ground) Oh no — I lost everything! Do you know how much money I had in there?
  (Kevin decks him)
  Kevin: He trusted you! He loved you! And what did you do? You used him! You used his feelings for you, and… now he’s gone.
  Argit: Sometimes, I just don't get you, Kevin. None of you.
  Gwen: No, you wouldn't.
• Kevin's Kirk Summation to Ra'ad in "Fused" — if for no other reason than it shows how far he's come from the punk he was in the original series.
• In a sick, sad sort of way, Kevin's "Can I have Quarrel back?" in "Nor Iron Bars In a Cage" to the prison warden was kind of heartwarming. The interaction in the flashback between Quarrel and a newly human-looking Kevin was also incredibly cute.
• At the end of Eunice's first episode, Ben sticking up for her against Azmuth when the latter wants to deactivate her as a non-necessary Omnitrix prototype. Ben was ready to fight his old mentor over that one.
• Ben kissing Gwen on the forehead before he sacrifices himself in "Ultimate Sacrifice".
• In "Ultimate Aggregor" Ben, Gwen, and Kevin were having a great time sharing jokes while drinking smoothies. What Ben says next really shows he misses the old times.
  "How come we don't do this anymore?"