Blackout is the largest Decepticon, transporting the other group members, and he has the ability to disrupt mechanical devices via EMP.
Blackout is said to have a cage that holds Skorponok, which is where the Soundwave connection was first made.
In Transformers, Blackout and his partner Skorponok attack the Soccent Operations Base in Qatar.
TRANSFORMS INTO: Sikorsky MH-53 JM Pave Low III/IV Helicopter