Voltron: Legendary Defender (season 4)

One day five teenagers, Keith, Lance, Hunk, Pidge and Shiro ended up on the planet named Altea. They woke princess Allura and her adviser Coran from age-old sleep. The guys learn about existence of five lion robots which can transform together into the greatest weapon in the universe, huge robot Voltron. Friends are to be Voltron pilots and protect galaxy from evil forces.