Heartwarming / Little Einsteins

• In the first episode of the series, "Ring Around the Planet", after Leo helps to reunite Little Ring with Saturn, June walks over to Leo, thanks him, and gives him a hug. This scene is frequently cited as the reason why Leo and June are a popular ship among the series' teenage and adult fans.
• The ending to "Knock on Wood", where Tapper the Ivory Billed Woodpecker finally finds a friend. Especially if you know a thing or two about ivory billed woodpeckers. ^note Ivory-billed woodpeckers are believed to be extinct; Tapper was likely alone for a long time until he finally found his friend
• Quincy is often encouraged by his friends whenever he shows or brings up his fear of the dark. In "Our Huge Adventure", Leo asks for Quincy's consent before they enter a cave to search for Butterfly. Shortly after he shows hesitation about going in, June comforts Quincy and tells him she and the rest of the team will be there with him.
  • In "The Northern Night Light", Quincy says that even though nighttime is approaching and the sky is getting dark, he wasn't going to stop because he wants to finish the mission, earning him compliments from Annie and June. However, when the team gets lost and the night finally arrives, he begins to panic as his fear gets the better of him. Returning the favor to Quincy for helping them not feel scared throughout the episode, Leo rallies Annie and June to do a silly dance in front of Quincy to cheer him up, which makes Quincy feel much more comfortable and able to continue the rest of their mission.
• Annie standing up for Butterfly and calling out the mean butterflies for teasing Butterfly in "The Missing Invitation".
• Leo and Melody's song in "Melody and Me". There is also when they finally reunite with each other at the end, Leo hugs Melody and she licks his face as a kiss. Aww.
• The Christmas Episode has everyone using their wishes to help search for Annie’s wish box.
  • Once Annie finds her wish box, she makes a wish... to be with her friends for Christmas.
• Leo and Annie walking together through the forest in "Brothers and Sisters to the Rescue". To be concise, Leo was determined to trek through the forest to save Hansel and Gretel, but before he leaves, his little sister Annie offers to join him because he's her brother. Leo lets Annie hold his hand when the latter is scared, with Annie also assuaging Leo's fear when a cuckoo bird sounds. Finally, after the mission is done, Annie hugs Leo and the two siblings wrap things up by declaring "Mission Completion!" together.
  Leo: We were a great team, Annie! I'm glad you're my sister.
  Annie: And I'm glad you're my brother, Leo.
• Leo reuniting with Rocket in "How We Became Little Einsteins: The True Story". It is heavily implied that Leo and Rocket were separated for years as a result of them growing up and Rocket having to fly off once he got too big for the baby mobile. For them reuniting, it is a big heartwarming moment.
  • The song the baby mobile plays is a bit heartwarming as well when one takes into account that the team always sings the first part of the song before going to fly off with Rocket for a mission. It is a song basically praising Rocket for being the one for making missions possible.