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U is for Undivided is the twenty-first episode of season 2, and the forty-seventh episode overall of the TV series.


the Guardians discovered that Lilian is actually the Heart of Earth, its source of magic, and had to protect her, while Cornelia attempted to gain her sister's trust.

Lilian accidentally turned her cat into a familiar and created a glamour zone around her home, based on Cornelia's bedtime story. The Guardians cleaned up the mess, and Matt, Mr. Huggles and Napoleon, Lilian's pet cat, become the Regents of Earth.

In the B-story, Cornelia started being happy for her sister.

Release notes

  • This episode aired after W is for Witch, causing confusion for some viewers.

Behind the scenes


  • Every second-season episode has a clear focus on one of the five main characters. This episode is one of 4 in the season to focus on Cornelia Hale.
  • Cornelia and Lilian are explicitly stated to be 14 and 8 respectively in this episode, making them two of the few characters to have exact ages given in the show itself. In Cornelia's case, this also supports the information from external sources about her being the oldest of the group, having already started the series at 13 while Will only turned 13 in one of the first episodes (Happy Birthday Will), as well as the girls all being a year younger than in the comics (at the start of each story).
  • It is revealed that Lilian is the Heart of Earth and likely why Cornelia was chosen to be the Earth Guardian, while Hay Lin was chosen to provide "continuity of spirit" across different generations of air Guardians. Despite eager questioning from the other girls, the reasons for them being chosen are not revealed, with Luba simply responding: "Such truths only emerge with the fullness of time".
  • The episode did not explain how Nerissa knew Lilian was the Heart of Earth right after W.I.T.C.H. just happened to find out, although it is possible her Seal allowed her to sense it, like she did with the Heart of Aridia in the next episode.
  • The bickering couple in the taxi are named Brenda and Marco, as a reference to Greg Weisman's Gargoyles, where a similar couple named Brendan and Margot Quarters would be frequently caught in the chaos caused by the titular gargoyles.
  • The episode's writer is Cary Bates, best known to comic fans for his fourteen-year stint as writer of the Flash, as well as writing Superman, Action Comics, Justice League of America, and Captain Atom (with Greg Weisman).