- “I'll see you soon… Yoyo.”
- — Mack to Elena, Bouncing Back.
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Elena and Mack had a hostile meeting as they both viewed each other as a threat. She uses her powers to kidnap him, but Mack gets free. Once Elena realizes that he is not a threat, their feelings begin to change, with Mack fondly calling her Yo-Yo—after her powers.
After undergoing Terragenesis, Elena believes that her new-found powers are a gift from God and should be used as resistance to the Spanish police, who had been abusing their status of policemen. Mack, along with The S.H.I.E.L.D. team arrives in Bogotá the next day to investigate. As Mack searches, he spots a female woman with heavy boots. The woman, Elena, notices him and instantly believes him to be a threat. Hence, she uses her powers to take Mack's gun out of his holster and points it at him. She then uses her powers to force Mack into the back of a van and kidnaps him.
To her annoyance, Mack wakes up and watches Elena with her cousin talking in Spanish. She later talks to him, but because of the language barrier; they were unable to understand each other. Mack comments that his powers are "like a Yo-Yo" However, Mack manages to convey that her powers manifested because of the fish pills, instead of God. Their conversation is soon cut short when Daisy Johnson and Joey Gutierrez interrupts and forces Elena into an S.H.I.E.L.D. containment pod.
After Joey convinces Elena that they are not a threat, Mack discusses the role their faith plays in their lives. After this, Elena begins to trust Mack. Both of them help each other to defeat Lucio.
Later, Elena apologizes to Mack for kidnapping him and says thank you, in English. He fondly calls her Yo-Yo in response and hopes that he will see her soon.
YoYoMack gained a decent amount of popularity after the eleventh episode of season 3 premiered. Many fans adored how Mack affectionately named Elena, Yo-Yo. Thus, their ship name became YoYoMack which was popularized as their ship name, immediately after the episode. Also, some fans theorized that either Mack or/and Elena are the ones in space in the flash-forward scene. Fans were distraught at the idea of this and the effect it could have on their relationship.
- In the comic universe, Earth-616, Elena's name is Yo-Yo Rodriguez. While in the Marvel Cinematic Universe, Mack gives the nickname "Yo-Yo" to Elena, similar to how he nicknamed Daisy Johnson as "tremors".
|SHIPS||het||BobbiFitz • Brutasha • Clintasha • FitzSimmons • Fosterson • Hawkwitch • Huntingbird • Iron Widow • Iron Witch • JessLuke • Kitscliffe • MayWard • NebulaRhodey • PeggySous • Philinda • Romanogers • Scarlet America • Static Quake • Steggy • Thunderwar • Winter Widow • YoYoMack|
|slash||Capsicoul • FitzHunter • FitzMack • FitzWard • Hawksilver • Iron Husbands|
IronStrange • Iron Winter • JackDaniels • Roquill • SamBucky • SamSteve
Science Boyfriends • Spiderlad • Stony • Stucky • T'Chalcon
Thunder Science • ThunderShield
|femslash||Cartinelli • Danbeau • Scarlet Widow • Simmorse • Valcarol|
|non-binary||FrostHawk • FrostIron • Frostmaster • Lokane • Scarlet Vision • Valki|
|family||Domestic Avengers • Iron Dad • Thorki|
|friendship||Stackie • Hiddlesworth|
|CHARACTERS||m/f||Bucky Barnes • Loki • Natasha Romanoff • Steve Rogers • Thor Odinson • Tony Stark|