In between his last appearance and this current one, Taruru has lost his tail, implying that he's grown into an adult Keronian.
First appearance of the Garuru Platoon, led by Giroro's older brother, Garuru.
the Garuru Platoon:
Lt. Garuru - Sniper
Private First Class Taruru - Infantry/Hand to Hand Specialist
Lance Corporal Zoruru - Ninja/Assassin
Recruit Tororo - Communicaitons and Intelligence
The title of the episode refers to an old sci-fi movie from the 1950's, The Day the Earth Stood Still