Gizmo

Gizmo is an Autobot from the Generation 1 series.

Gizmo was one of the many casualties of the war for Cybertron before the launch of the Ark.

Fiction

Dreamwave Generation 1 Comics

The Decepticons Frenzy and Rumble mention Gizmo as one of the various Autobot casualties while enjoying some downtime, getting to the "G"s in tallying up the known dead.

From Teletraan I: The Transformers Wiki, a Wikia wiki.