G.I. Joe: A Real American Hero 54-A

"Launch Base"

Sepentor has gotten Cobra into the business of selling Terrordromes to the highest bidder, the first client being Sierra Gordo.
Slipstream introduces himself to the Joes, but he was actually in #49, and was addressed by name.
Cobra Commander and Destro are still buried under the remains of the Pit.
Hawk and Airtight come up with a plan to infiltrate a Terrordrome by disguising Snake-Eyes as Flint.

First appearance of Dialtone (nonspeaking), A.V.A.C. Firebat pilot. Conquest X-30 jet.