Cassgene

Cassgene is the het ship between Flynn Rider and Cassandra from the Tangled fandom.

Canon
Sometime after Eugene brings Rapunzel back to the castle, so she can be with her birth family, and began to live castle life with, he meets Rapunzel's assigned handmaiden Cassandra who wasn't very fund of him. Since she doesn't like the fact that Eugene is the thief Flynn Rider, to which has Eugene disliking Cassandra (who he has nicknamed the "Dragon Lady") from how she talks and treats. Even though Eugene had trouble fully understanding why Rapunzel would want to befriend someone like Cass, he still helps her to gain Cassandra's friendship through an activity that came in the form of the Contest of the Crowns and when it got to the final challenge, Eugene watches Cassandra as she and Rapunzel face the giant iron lion from the stands. After Cass became friends with Rapunzel, she began to it and the princess's duties as a means to ruin any romantic moments Eugene tries to have with Rapunzel, as while Rapunzel is very close with both of them Eugene and Cassandra still weren't very fund of each other.

Tangled: Before Ever After
When Eugene got back from his horseback ride with Rapunzel and was about to kiss Rapunzel, Cassandra smiles as she brings Rapunzel back to the castle before Eugene could have that kiss. Later at night all, Cassandra finds Eugene trying to have another romantic moment with Rapunzel and when she had her presence known to Eugene, he fell into the water and instead of helping him Cassandra gives Eugene a teasing smile and words before leaving him to get out of the water on his own. Cassandra later witnesses Eugene prepossessing to Rapunzel, without knowing that their shared friend isn't ready for marriage, Cass accuses Eugene for thinking about himself. The morning after Cassandra's actions had caused Rapunzel's long hair to grow back, she wasn't happy that Eugene knows of it, but was glad that he isn't aware of the part she played in it and that he wants to help her hide Rapunzel's sudden hair growth from everyone else. With that problem solved, Eugene goes to have a quick talk with Cassandra while she is giving Rapunzel's coronation dress a finishing touch, because they dislike each other their talk about nearly turned into a fight until she tells him that "That's not true, I don't like you for anybody," which had gotten Eugene to realize that Cass might be right despite her harshness.

At the coronation, Eugene and Cassandra sure a quick glance with each other as they were both worried about Rapunzel, and Cass later hears Eugene saying the name of the pirate thief that crashed it when Lady Cain had herself known. After Rapunzel made the first move in freeing the King from Cain and her crew of fellow criminals, Eugene and Cassandra began to lend their friend a hand and were able to save the day. Once the Cain and her men were defeated, both Eugene and Cassandra witness the party criminal crushers being hand cuffed together before they were brought to the castle's dungeon, with exchanging mean words to each other as they do so. As they were both too proud of their heroic actions to think about having another one of their bickering fights.

Fanon
While Cassgene isn't the most popular het ship in the Disney Tangled fandom, it still has its fans. Because of the episode, "Cassandra v. Eugene", where Eugene and Cassandra tell each other that they are both orphans who didn't know who their birth parents were, at that time before the identities of their parents were revealed in season two and three, a few fans had began to theorize that the two might had been siblings. Since they bicker like a brother and sister who don't get on with each other and try to get the better of one another.

Fandom
FAN FICTION
 * Cassandra/Eugene tag on FanFiction.Net
 * Cassandra/Eugene tag on FanFiction.Net

Variations

 * Cassgeneunzel refers to the ship between Cassandra, Flynn Rider and Rapunzel