When were the Alien Rangers in Japanese footage in Power Rangers?

The Alien Rangers appeared in the Japanese footage from the Super Sentai series "Kyuukyuu Sentai GoGoFive," which aired in 1999. In the American adaptation, they were introduced in "Mighty Morphin Power Rangers" during the "Alien Rangers" storyline, specifically in the episodes that aired in 1996. The Alien Rangers were featured as a temporary team while the original Power Rangers were turned into children.