Le labyrinthe souterrain

Optimus Prime allows the kids (Rad, Carlos and Alexis) and their Mini-Cons to go with Hot Shot and Wheeljack underground Cybertron in pursuit of Thrust.
The Autobots wish to focus on Unicron so they pull their troops from Decepticon battlefronts. Galvatron considers an alliance.
Starscream follows Thrust through an underground warp gate to Sideswipe's lair in some large technorganic chamber somewhere. Starscream refuses to join with them, so Sideways summons a swarm of bot-spiders.
Hot Shot and Wheeljack's team shows up and the kids and Perceptor try to awaken the Skyboom Shield and Requiem Blaster's Mini-Cons to liberate them from Thrust, but to no avail. Hot Shot and Wheeljack ""link up"" and spin away the technorganic defenses.
Sideways and Thrust flee to a glowing core and Starscream joins Hot Shot's coalition in their pursuit, but the organic defenses are too much and they must escape. Alexis runs back for her necklace and Starscream goes back to get her and Sureshock.
The coalition

Next episode

S01E48 - La fin de Starscream