Here is a gallery of various assorted Marvel comics that I used to have : -
It transpired that the Defenders were a "none - team" (??), created by Doctor Strange and I did start buying it in the eighties, but it wasn't until they became "The New Defenders" that I became really keen.
This was because they contained three - fifths of the original X-Men!
At the end of the title's run, those 3 members would at long last reunite with the other original two members and the X - Factor would be born!
The original AND the new X-Men teams in two separate comics!
We were spoilt for choice in the 80's!