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 one queen (Uniqua) who has the power to break evil spells, he met six 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.

Characters

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

Trivia

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