Background: Supergirl is a fictional superhero appearing in American comic books published by DC Comics. The character was created by writer Otto Binder and designed by artist Al Plastino. Supergirl first appeared in a story published in Action Comics #252 (May 1959) titled "The Supergirl from Krypton". Kara Zor-El is the biological cousin of Kal-El (Superman).
Context: Summer Glau voices the post-Crisis version of Kara Zor-El in Superman/Batman: Apocalypse, which is based on the Superman/Batman storyline "The Supergirl from Krypton." Despite this, it was confirmed by director Lauren Montgomery that Supergirl's name was removed from the title due to the much slower sales of the previous Wonder Woman animated movie, and the character was not permitted to appear on the cover in her trademark outfit. In the movie, Kara arrives on Earth in a rocket and is discovered by Batman and Superman. After living amongst the human race and receiving training from the Amazons, Kara is kidnapped by Darkseid and brainwashed into becoming one of his Female Furies. She is ultimately rescued by her cousin, and returns to Earth. After arriving back at the Kent home, Kara and Clark are attacked by Darkseid, and a massive battle ensues. Kara nearly defeats Darkseid thanksto her Amazonian training but is overpowered and almost killed. Kara ultimately saves the day by using a Boom Tube to teleport Darkseid into an unknown area of space, where he is shown to be frozen and floating aimlessly. At the film's conclusion, Kara adopts the Supergirl identity and vows to fight injustice alongside her cousin.  Molly Quinn voices Supergirl in Superman: Unbound.  Supergirl appears in Lego DC Comics Super Heroes: Justice League: Cosmic Clash, voiced by Jessica DiCicco.  DC Super Hero Girls or DC Superhero Girls (in various countries) is an American super hero action figure franchise created by DC Comics (a subsidiary of Time Warner) and Mattel that launched in the third quarter of 2015. The franchise was announced in April 2015. The range is to include books from Random House, Lego tie-ins and action figures from Mattel. The website was launched in early July 2015. Characters featured at launch were Wonder Woman, Batgirl, Harley Quinn, Poison Ivy, Katana, and Bumblebee. Other characters including Hal Jordan, Barry Allen, Star Sapphire, Beast Boy, Cheetah, Hawkgirl and Catwoman also appear. Amanda Waller is featured as the principal of the series' setting Super Hero High. Many other DC Comics Heroes and Villains appear in the background as cameos. The story is about at Super Hero High School, well-known DC heroes attend classes and deal with all the awkwardness of growing up (with the added stress of having superpowers). Supergirl was voiced by Anais Fairweather. A movie DC Super Hero Girls: Hero of the Year based on the series, was released in 2016.
Question: How was the box office?

Answer:
Girls: Hero of the Year based on the series, was released in 2016.