First Aired: Sep. 21, 2006 on Cartoon Network
Summary: The Autobots and Decepticons finally reach the lowest depths of Giant Planet. Coby and Landmine head to the spaceship Lemuria where the Planet Key is located. Meanwhile Galvatron arrives and confronts Optimus, who is doubting himself after the defeat of the Cybertron Defense Team.
Watch Episode On:- Tubi TV (free)
Guest Stars[no credits found]