Thread:AnnabellRice/@comment-38016266-20190808174325/@comment-16461120-20190808183957

I'm not familiar with that specific story, but essentially a licensed appearance is where a property not owned by Marvel crosses over with those which are, in the case of Phineas and Ferb it's likely because both "universes" were owned by Disney at the time and thus the crossover was merely a novelty, but it's no different than DC being paid a small fee to allow a statue of Superman to appear on Seinfeld. It's pop culture trivia, but not considered relevant enough to warrant inclusion within Marvel's continuity, likely because the company had little or no part in its creation.