Transformers Vol 1 #19 (NM)

The Autobots attack the Decepticons in order to discover the secret transformation matrix of Devastator.

Meanwhile, Megatron plans a secret attack on Autobot base where he and his troops run into the newly built Omega Supreme.

Starscream, Skywarp, Thundercracker, Frenzy, Rumble and Buzzsaw all die while fighting the enormous Autobot.