Cosmos - First Appearance, Appearances and Key Issues

First appearance: the evidence

Source	Claim
This record	The Transformers #17	1986-06

Related identities: Cosmos.

Issue	Date
Who's Who: The Definitive Directory of the DC Universe #1	1985-03
Arkham Asylum #[nn]	1989-11
Arkham Asylum #[nn]	1990-06
Harley Quinn #5	2001-04
Harley Quinn by Karl Kesel and Terry Dodson: The Deluxe Edition #1	2017-11
Batman: Arkham Asylum #[nn]	2020-08
DC Finest: Harley Quinn: The Birth of the Mirth #[nn]	2025-04

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