Howard the Duck Returns (sort of)
What If Season 1, Episode 2 features an appearance by Howard the Duck. Howard was one of my favorite characters in the Marvel universe. Howard's creator Steve Gerber was a mad genius and Howard's original comic book series was way ahead of its time, filled with hilarious satire and commentary on the sad state of society.
It's too bad that Howard only appears in the What If episode for a few minutes. Even worse, it's the "Disney-approved" version of Howard. In the mid-70s Disney threatened to sue Marvel Comics if they didn't make significant changes to Howard to avoid potential confusion with Donald Duck - the recommended changes appear in the model sheet below.
This model sheet summarizes Disney's recommended changes to the original version of Howard. Unfortunately Howard has since been changed to become even uglier. Ugh.
Real Howard fans know that the version of Howard in the Marvel Universe is actually a clone. The real Howard fled Marvel, was dyed green, and is now in a witness protection program residing in Buffalo, NY under the name "Leonard".