Question: What science fantasy young adult series, told in first person, has a set of companion books narrating the stories of enslaved worlds and alien species?

 It is told in first person, with all six main characters taking turns narrating the books through their own perspectives.  Horror, war, dehumanization, sanity, morality, innocence, leadership, freedom and growing up are the core themes of the series. Animorphs is a science fantasy series of young adult books written by Katherine Applegate and her husband Michael Grant, writing together under the name K. A. Applegate, and published by Scholastic. <SEP> The Andre Norton Award for Young Adult Science Fiction and Fantasy is an annual award presented by the Science Fiction and Fantasy Writers of America (SFWA) to the author of the best young adult or middle grade science fiction or fantasy book published in the United States in the preceding year.  It is named to honor prolific science fiction and fantasy author Andre Norton (1912–2005), and it was established by then SFWA president Catherine Asaro and the SFWA Young Adult Fiction committee and announced on February 20, 2005.  Any published young adult or middle grade science fiction or fantasy novel is eligible for the prize, including graphic novels.  There is no limit on word count.  The award is presented along with the Nebula Awards and follows the same rules for nominations and voting; as the awards are separate, works may be simultaneously nominated for both the Andre Norton award and a Nebula Award. <SEP>  With respect to continuity within the series, it takes place before book #23, "The Pretender", although the events told in the story occur between the time of "The Ellimist Chronicles" and "The Andalite Chronicles".  The book is introduced by Tobias, who flies to the valley of the free Hork-Bajir, where Jara Hamee tells him the story of how the Yeerks enslaved the Hork-Bajir, and how Aldrea, an Andalite, and her companion, Dak Hamee, a Hork-Bajir, tried to save their world from the invasion. The Hork-Bajir Chronicles is the second companion book to the "Animorphs" series, written by K. A. Applegate.  Jara Hamee's story is narrated from the points of view of Aldrea, Dak Hamee, and Esplin 9466, alternating in similar fashion to the "Megamorphs" books. <SEP> Science Fantasy, which also appeared under the titles Impulse and SF Impulse, was a British fantasy and science fiction magazine, launched in 1950 by Nova Publications as a companion to Nova's "New Worlds".  Walter Gillings was editor for the first two issues, and was then replaced by John Carnell, the editor of "New Worlds", as a cost-saving measure.  Carnell edited both magazines until Nova went out of business in early 1964.  The titles were acquired by Roberts & Vinter, who hired Kyril Bonfiglioli to edit "Science Fantasy"; Bonfiglioli changed the title to "Impulse" in early 1966, but the new title led to confusion with the distributors and sales fell, though the magazine remained profitable.  The title was changed again to "SF Impulse" for the last few issues.  "Science Fantasy" ceased publication the following year, when Roberts & Vinter came under financial pressure after their printer went bankrupt.