Question: What is the name of this American animated television series produced by Disney Television Animation whose 18th episode premiered in June, 2013?

Context paragraphs:
The 7D: The 7D is an American children's animated television series produced by Disney Television Animation, which premiered on Disney XD on July 7, 2014.  It first air on Disney Junior block on December 2, 2014.  then it aired on Disney Channel in late summer 2014.  is a re-imagining of the title characters from the 1937 film "Snow White and the Seven Dwarfs" by Walt Disney Animation Studios, and their adventures prior to the introduction of Snow White.  The first season consisted of 24 episodes.  On December 2, 2014, the series was renewed for a second season.  The show aired its final episode on November 5, 2016.

Lilo &amp; Stitch: The Series: Lilo & Stitch: The Series is an American animated television series produced by Walt Disney Television Animation.  It premiered on September 20, 2003 on ABC as part of ABC Kids, with a delayed premiere on Disney Channel on October 12, 2003.  The series ended on July 29, 2006 after airing 65 episodes in two seasons.  A sequel spin-off of the 2002 feature film "Lilo & Stitch", and the follow-up to the August 2003 direct-to-video pilot "Stitch!  The Movie", it was the first of three television series produced in the "Lilo & Stitch" franchise.  It was aired on Disney Channel worldwide, but has only been released on DVD in full in Japan, in four box sets.

The Little Mermaid (TV series): Disney's The Little Mermaid is an American animated television series produced by Walt Disney Television Animation based on the 1989 Disney film of the same name.  It features the adventures of Ariel as a mermaid prior to the events of the film.  This series is the first Disney television series to be spun off from a major animated film.  Some of the voice actors of the film reprise their roles in the series, among them Jodi Benson as Ariel, Samuel E. Wright as Sebastian, Kenneth Mars as King Triton and Pat Carroll as Ursula.  Other voice actors include Edan Gross and Bradley Pierce as Flounder, and Jeff Bennett as Prince Eric.

Star vs. the Forces of Evil: Star vs. the Forces of Evil is an American animated television series produced by Disney Television Animation.  The first episode was shown on January 18, 2015, on Disney Channel as a special preview, and the series officially premiered on March 30, 2015, on Disney XD.  The show was created by Daron Nefcy, who had worked on storyboards for "Wander Over Yonder" and "Robot and Monster".  Nefcy became the second woman to create an animated series for Disney Television Animation (the first being Sue Rose, who created "Pepper Ann"), and the first woman to create a Disney XD series.  On February 12, 2015, Disney renewed the series for a second season prior to its premiere on Disney XD.  The second season premiered on July 11, 2016.  On March 4, 2016, it was renewed for a third season, with a two-hour TV movie called "The Battle for Mewni", which aired on July 15, 2017.  On February 28, 2017, it was officially renewed for a fourth season.

Disney's House of Mouse: Disney's House of Mouse is an American animated television series, produced by Walt Disney Television Animation (now Disney Television Animation), that originally aired from 2001 to 2003.  On September 2, 2002, an all night marathon of this show titled "Night of 1000 Toons" aired on Toon Disney.  "Disney's House of Mouse" is a spin-off of the popular short-lived Disney series "Mickey Mouse Works", and featured many Mouse Works shorts as well as new shorts created specifically for the spin-off series.

List of Chip 'n Dale Rescue Rangers episodes: " "is an American animated television series produced by Walt Disney Television Animation.  Created by Tad Stones and Alan Zaslove, it featured the established Disney characters Chip 'n Dale in a new setting.  The series premiered on The Disney Channel on March 4, 1989, having aired the first produced episode, "Catteries Not Included", as a special preview on August 27, 1988.

Land Before Swine: "Land Before Swine" is the 18th episode of the first season of Gravity Falls.  It premiered on June 28, 2013.

List of The 7D episodes: "The 7D" is an American animated television series produced by Disney Television Animation.  It premiered on July 7, 2014 and ended on November 5, 2016 and airs on Disney XD worldwide (Disney Channel and Disney Junior in some countries).  It is a re-imagining of the title characters from the 1937 film "Snow White and the Seven Dwarfs" by Walt Disney Animation Studios, and their adventures prior to the introduction of Snow White.  The first season consisted of 24 episodes.  On December 2, 2014, the series was renewed for a second season.  On April 25, 2016, it was announced that "The 7D" would not continue after the second season.

Recess: School's Out: Recess: School's Out is a 2001 American animated comedy film based on the Disney television series "Recess".  It was produced by Walt Disney Pictures, Walt Disney Television Animation and Walt Disney Television Animation Digital Production with animation done by Sunwoo Animation and Sunwoo Digital International.  The film was distributed by Buena Vista Pictures Distribution, and released theatrically in the United States on February 16, 2001.

Gravity Falls: Gravity Falls is an American animated television series produced by Disney Television Animation originally for Disney Channel (and then later for Disney XD) from June 15, 2012 to February 15, 2016.

Supporting paragraphs: Land Before Swine Gravity Falls
Answer: Gravity Falls