Sersi of the Eternals Appreciation (2019)
First appearance: [B]The Eternals #3[/B] (September 1976):
[url=https://servimg.com/view/18913714/1396][img]https://i67.servimg.com/u/f67/18/91/37/14/eterna10.jpg[/img][/url]
[url=https://servimg.com/view/18913714/1398][img]https://i67.servimg.com/u/f67/18/91/37/14/eterna11.jpg[/img][/url]
Though it appears they later retconned it to being a single panel in [B][I]Strange Tales #109[/I][/B] (June 1963) as her "first" appearance?
[url=https://servimg.com/view/18913714/1397][img]https://i67.servimg.com/u/f67/18/91/37/14/strang10.jpg[/img][/url]
In the 1980s, Roger Stern started having her appear in [B]The Avengers[/B] with Sersi eventually becoming a member of that team.