Transformers: Combiner Wars

The Autobots and Decepticons’ uneasy peace is threatened by the flames of war! Starscream — ruler of Cybertron — makes contact with Windblade's homeworld — and the only defense against a new Cybertronian Empire are Combiners — multiple Cybertronians forming together into huge, dangerous forms!
Collects issues #39–41 of Transformers and the first three issues of Transformers: Windblade — Combiner Wars.