S03:E09 - Starscream's Ghost

Octane, a Decepticon traitor, is on the run and the Decepticons are pursuing him across the galaxy. Despite Sandstorm's help, there is little protection that the Autobots can actually offer him. Then, Octane takes refuge in some kind of ancient Decepticon crypt on Cybertron, where he encounters the vengeful ghost of his former comrade, Starscream who is scheming to seek his revenge against Galvatron for destroying him. The conniving villain secretly conspires with Octane to destroy their former leader once and for all.