Archa Seven

Archa Seven is a largely organic planet, dusty and rocky on the surface, with crystalline webs overhanging its large cliffs, and small mushroom-like plants in its canyons. It has a large network of tunnels, which are home to a race of giant spiders, as well as containing an abandoned Decepticon ship. It apparently has three moons.

Animated cartoon
Following a battle over Archa Nine, the Decepticon starship Twilight crashed on Archa Seven.

Sentinel, Optimus and Elita-1 landed on Archa Seven due to rumors of the Decepticon ship crashing there. Optimus objected as he said there were reasons organic planets were off-limits to Autobots, but Sentinel twisted his arm by emphasizing that the Decepticons were chronic hoarders of energon, and that if they found the ship they were bound to be set for life.

After accidentally falling into the cavern network, the Autobots were attacked by the native spiders and separated from each other. Optimus eventually found the wreckage of the Twilight, but was forced to detonate its energon stockpile in an attempt to kill the spiders. The vessel was destroyed, and Elita-1 was believed to have gone with it.