Kikai Sentai Zenkaiger Infinite Happy Birthdays! Season 1 Episode 39 Airdate: December 12, 2021 Synopsis The Zenkaigers and World Pirates attempt to continue celebrating Kaito's birthday, Christmas, and New Year's, but Shougatsu World attempts to use his powers to make them forget the past year. ← Your Ancestors! Great Spirit World All episodes Rescue My Father, One Chance! →