Serpentor is a Cobra operative in the original G.I. Joe: A Real American Hero line. First released as a Hasbro carded action figure in 1986, with 1 distinct figure version produced across the 1982 to 1994 ARAH run.
Serpentor appears in 12 episode synopses across the Sunbow (1983 to 1987) and DiC (1989 to 1992) runs, first appearing in Sunbow's "Arise, Serpentor, Arise!, Part 1" (1986). Full screencap and continuity review pending.