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.

IDW comics continuity

Spotlight: Hot Rod

Cute little guy, ain't he?

Gizmo was one of the Autobots in Hot Rod's first command. It is unknown whether this is the same Gizmo that Rumble and Frenzy mentioned.

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