User blog comment:ADour/Ultimate Comics Ideas/@comment-3048593-20130101200630/@comment-3048593-20130101202937

Yeah, there's no denying there are some Ultimate Characters that Marvel simply have forgotten were even made.

I was surprised Hickman and Bendis decided to bring back the Ultimate version of Hydra during the "Divided we Fall, United we Stand" event. Previously, they had only appeared in a flashback in, and didn't appear until more than 3 years later in. I would say Hickman decided to include them because of Iron Man's previous encounter with them, but why Viper was never brought up in the comics doesn't make sense.