Rom
Rom is proof that a toy license could produce genuine tragedy. Bill Mantlo took a barely-selling Parker Brothers action figure and built a 75-issue war epic around a Galadorian knight who gave up his humanity, sealing his flesh inside cyborg armor, to hunt the Dire Wraiths. The emotional engine of the whole run is that sacrifice: Rom can save Earth but can never again be seen as a man, only as a frightening metal stranger the people he protects don't trust.
The run is now gathered as Rom: The Original Marvel Years. Volume 1 collects the founding issues with Sal Buscema's clean, powerful art, establishing the neutralizer, the energy analyzer and the terror of an enemy that can wear anyone's face, including inside S.H.I.E.L.D. Later volumes escalate the secret Wraith invasion into a full Earth war and weave through the wider Marvel Universe.
Filters
Start with Rom: The Original Marvel Years Omnibus Vol. 1. It is the definitive way to read a series that was out of print for decades due to licensing, and Buscema's Wraith-hunting issues are the emotional core. Newcomers get a complete, self-contained cosmic tragedy.