Megatron

Few villains carry the sheer weight of Megatron, and this Modern Age Marvel incarnation — debuting in New Avengers / Transformers #1 in 2007, courtesy of Stuart Moore and Tyler Kirkham — drops him into a collision course with some of comics' heaviest hitters. Sharing pages with Optimus Prime, Bumblebee, and Captain America himself, this crossover event places Megatron at the center of a genuinely ambitious Marvel-Transformers mashup that fans of either universe had reason to pay attention to. It's a compact but memorable catalog presence, the kind of crossover curiosity that rewards collectors who love the unexpected intersections of beloved franchises.