Talk:Darth Vader VS Doctor Doom/@comment-16919137-20150630013337/@comment-25182985-20150630015328

https://www.youtube.com/watch?v=XraW1-lsEDk

Also this.

http://tvtropes.org/pmwiki/pmwiki.php/Trivia/DeathBattle

Look in the Trivia about the Show, Hosts and Cast.

In other words, they didn't confirmed it would happen, they just mentioned the idea of the fight along with considering on using Darkwing Duck as a combatant.