The Horse Kings

 is the sixteenth episode of "Backyardigans x Frontyardigans" written by Hornean.

Summary
King Austin was put under a spell by three evil queens (Sophie, Henwen, and Tasha) that transformed him into horse. In his journey to find the two queens (Uniqua and Denise) who have the power to break evil spells, he met seven other kings who have also been cursed by the three queens. The side effect for the spell is they turn to normal at night and turn back to horses at daytime and when they're horses, they were unable to speak.

Characters

 * Austin (King Austin)
 * Andrew (King Andrew)
 * Victor (King Victor)
 * Thomas (King Thomas)
 * Tyrone (King Tyrone)
 * Martin (King Martin)
 * Pablo (King Pablo)
 * Moe (King Moe)
 * Uniqua (Queen Uniqua)
 * Denise (Queen Denise)
 * Sophie (Queen Sophie)
 * Henwen (Queen Henwen)
 * Tasha (Queen Tasha)

Trivia

 * The horse sound effects were used from the 1979 film, The Black Stallion.