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"Sister of Invention" is the fiftieth episode of the Disney Channel animated series Elena of Avalor. It premiered on October 7, 2019 and is the first episode in the third season.


At Avalor Palace, the Royal Family and their friends are having a party to celebrate Isabel completing her Engineering Class with honors. Suddenly, Gabe comes in and tells Elena "He says he'll talk but only to you." Isabel notices Elena and Gabe leaving and asks what's going on. Elena tells her it's nothing for her to worry about and leaves with Gabe.  

Elena and Gabe head down to the dungeon and arrive at Victor's cell. Elena asks Victor what he has to tell her. Victor merely tells her that it's to inform her that he'll tell her nothing. Elena tries to get him to tell her where Ash and Carla are but gets nowhere until she mentions the Delgados' Cabin. Realizing that the Delgados didn't know they discovered it, Elena decides to ambush Ash and Carla at the Delgados' Cabin. Elena sends Gabe to fetch Naomi and Mateo. Isabel notices Naomi and Mateo leaving and follows them after grabbing her Go-Pack. Isabel uses one of her inventions to eavesdrop on Elena's plans. However, Gabe notices and exposes her. When Elena confronts her, Isabel voices how she wants to come on the grounds that she has inventions and gadgets that can help and that she can handle herself as she's been to college. Elena refuses both because it's dangerous and her belief that Isabel will just get in the way and sends her back to the party. Undeterred, Isabel changes into her hiking outfit and climbs inside the luggage rack on the Royal Carriage where she falls asleep after it sets off. 

The group arrives at the Delgados's Cabin. Elena, Naomi, Gabe, and Mateo surround the cabin. Isabel wakes up and gets out of the luggage compartment. Elena hears her and sends her friends in. Naomi, Gabe, and Mateo only end up attacking each other as Ash and Carla aren't there. Back outside, Elena is shocked to see Isabel and is angry at her, to the point where she calls her by her full name "Isabel Castillo Flores". Isabel doesn't even notice her big sister's displeasure as she's too busy examining little blue rocks which she traces to the cabin while being folllowed by Elena who is furious both because Isabel isn't even listening to her and because Isabel is walking away while she's still talking to her. Isabel tells the group that the blue rocks are lava rocks that only come from one place: Xotep, a volcano in Central Avalor that known for it's eerie blue lava. The group tells Elena to let Isabel stay especially after she reveals she has a map to Xotep. Elena agrees on the condition that she stay in the coach. 

At Xotep, Ash and Carla have indeed shown up there and have met the Malvago who trained Ash: Zopilote. Ash asks Zopilote for new tamboritas but he instead gives Ash a puzzle map that reveals a map to Takaina, the crystal forge where the Maruvians used create their mystical treasures and artifacts, including the Scepter of Light. Ash tells Carla to practice her tamborita while she solves the puzzle. Outside, the blasting draws the attention of Elena's group. Isabel suddenly gets off the coach and capture Carla with her invention, only to lead to the situation where Mateo messes up his spell and causes Elena to dangle from a cliff. Her friends try to save her in different ways, but none of them work. Meanwhile, Isabel calculates the distance of the rope to the cliff and comes up with an idea to make a catapult with rocks. She informs the group about this, and the group rescues Elena using what Isabel explained to them while the Delgados escape. Elena thanks her friends for saving her, to which they say it is really Isabel who she should thank since she is the one who came up with inventions to save her. Yet, Isabel feels guilty that she is the one who put Elena in danger in the first place and admits that she can't do what Elena and her friends do. Elena is glad that Isabel finally sees that, and encourages her by saying that they can't do what Isabel does, either (saving others with inventions). She welcomes Isabel to the team but still grounds her for disobeying a royal order.




  • Ash’s origin story is told in this episode.
  • Isabel joins Elena's team in the end.
  • Starting with this episode, the episode title is spoken, but the title card is discontinued.
  • Moral: Never underestimate someone just because they're very young.

International Premieres


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Elena of AvalorElena and the Secret of Avalor (Videography/Soundtrack/Original Soundtrack) • Books
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Princess ElenaPrincess IsabelMigs, Luna, and SkylarFranciscoLuisaChancellor EstebanNaomi TurnerMateoGabeZuzoArmandoDaniel TurnerDoña PalomaHigginsProfessor MendozaPrince AlonsoShurikiAlacazarKing Raul and Queen LuciaKing ToshiCharocaRafaFieroKing Juan RamónYacalliKing HectorKing JoaquínKing LarsKing RajaCarmen and JulioDoña AngelicaOrizabaCristinaCielaRico VillalobosRoberto NúñezBlanca NúñezPrincess CaterinaNicoChief ZephyrAviónTroyoSeñorita MarisolQuiqueAmaraLord ElrodSir CassiusScarlett TurnerVictor DelgadoCarla DelgadoCacahuateBoboOliviaKing VeragoMarimondaQuita MozAntonio AgamaPrincess ValentinaMingo, Zoom, and EstrellaDulceCruzVestiaProfessor OchoaZuni, Maya, and LomoLama, Hool, and QapaTomikoJavierSantos GutierrezPrincess MarisaPrince MarzelCucoKing PescoroQueen CamilaDuke CristóbalSalosoAsh DelgadoQueen AbigailTornadoZopiloteFloSanzaTito the Magical BanditChatanaPiliTzilocoPrincess ChloeMaligaIxlanFour Shades of AwesomeKizinPrincess RebeccaGrand MacawAntonia Bello

Sofia the First: Princess SofiaKing Roland IIQueen MirandaPrincess AmberPrince JamesFloraGwen

Season One: "First Day of Rule" • "Model Sister" • "All Heated Up" • "Island of Youth" • "Spellbound" • "Prince Too Charming" • "Finders Leapers" • "Royal Retreat" • "A Day to Remember" • "The Scepter of Light" • "Navidad" • "Olaball" • "Flight of the Jaquins" • "Crystal in the Rough" • "The Princess Knight" • "Captain Turner Returns" • "King of the Carnaval" • "My Fair Naomi" • "Spirit Monkey Business" • "Wizard-in-Training" • "Realm of the Jaquins" • "The Gecko's Tale" • "Party of a Lifetime" • "Blockheads" • "Masks of Magic"

Season Two: "The Jewel of Maru" • "Royal Rivalry" • "The Curse of El Guapo" • "Three Jaquins and a Princess" • "A Spy in the Palace" • "Science Unfair" • "Rise of the Sorceress" • "Shapeshifters" • "The Scepter of Night" • "The Race for the Realm" • "A Tale of Two Scepters" • "Class Act" • "All Kingdoms Fair" • "A Lava Story" • "Song of the Sirenas" • "The Tides of Change" • "The Return of El Capitán" • "Finding Zuzo" • "Snow Place Like Home" • "Two Left Fins" • "Movin' On Up" • "Not Without My Magic" • "Luna's Big Leap" • "Naomi Knows Best"
Season Three: "Sister of Invention" • "To Save a Sunbird" • "Father-in-Chief" • "The Incredible Shrinking Royals" • "Norberg Peace Prize" • "The Magic Within" • "Flower of Light" • "Captain Mateo" • "Sugar Rush" • "The Family Treasure" • "Dreamcatcher" • "Changing of the Guard" • "King Skylar" • "Spirit of a Wizard" • "Team Isa" • "The Last Laugh" • "Festival of Lights" • "The Birthday Cruise" • "Giant Steps" • "Shooting Stars" • "Crash Course" • "Sweetheart's Day" • "The Lightning Warrior" • "Dia de las Madres" • "Heart of the Jaguar" • "Elena's Day Off" • "To Queen or Not to Queen" • "Coronation Day"

Theme SongReady to RuleSister TimeBlow My TopAvaloran LullabyAvalor Birthday SongThe Magic Within YouFeel Free to Have FunSomething SpecialTo Be In My ClubFestival of LoveThe Gift of NightThe Great UnknownThe Spirit of AvalorMy TimeThe Way We Do NavidadLet Love Light the WayPlay It Your WayThe Bros Are BackFix AnythingSteppin' UpHome for GoodSomething I Would Never DoThe Bright Light of the BallYour Spirit GuideCast A Spell With MeGot It DownA Big DealYou Can't Catch MeForeverIt's Up To UsBest for Our GuestsMake Them ProudA Little Bit MoreThe Captain of the GuardI Am Grown Up EnoughDon't Look NowHand in HandThis New DayThe Right Thing To DoWisest Wizard in the WorldIf You Just Keep Moving OnOnly One Will RemainWelcome to the FutureArmandoFallin' Like a RockFamilia ForeverA New TaleOur ChanceThe Art of the StealThe Legend of Los TresTop Banana KingHome for NavidadHearts Full of CheerThe Most Royal ManNever Get AwayMore Than Your MagicGive Me A ShotSpeakThe One and OnlyChief DaddyHappy to Be AliveLove AlwaysThe Spirit of LovePick It Up Wings UpBy My SidePut Your Mind To ItMagic Works Like a CharmGirl's DayChoose Your PathBegin A New JourneyFit To Be QueenFour Shades of AwesomeNever Too LateGuiding Light
AvalorSatuFountain of YouthCordobaEnchanciaSecret LibraryRoyal Preparatory AcademyMaruEverRealmSpirit WorldVallestrellaOphidan IslandTakaina
Amulet of AvalorScepter of LightCodex MaruEye of MidnightBehind the WallsShuriki's WandCoza KexScepter of Night
See Also
Sofia the FirstJaquinsNoblinsChanulSpells