Doubutsu Sentai Zyuohger Episode 1

Yamato Kazakiri, a young zoologist, is serving as a guide during a nature observation when a mysterious cube takes him to Zyuland, a strange world inhabited by humanoid animals known as the Zyumans. Yamato meets four Zyumans while in Zyuland: Sela, Leo, Tusk, and Amu. When the human world is attacked by space outlaws called the Deathgaliens, Yamato’s new friends transform to fight the threat. A new passionate desire is brought to life within Yamato after witnessing the transformation. (Source: powerrangers.fandom.com)