Thor is upset that Sif left him to go search for Balder. He and Hildegarde go to Avengers Mansion. Jarvis offers them tea and Thor is very rude.
Forsooth, he be a dick.
Then he takes a nap and makes amends.
Then, it’s the return of Mercurio.
When he is defeated, Thor learns about bitterness, which is a call-back to his dickish behavior, above.
Nice little morality play. All that and a letter from Back to the Future cowriter (and occasional Marvel Comics author) Bob Gale.