All-Father's Day is the 20th episode of the first season of Avengers Assemble and the 20th episode of the series overall.
Odin comes to the Avengers Tower demanding that Thor cease his "fun" on Earth and return to Asgard. Thor promises that if he can't prove the good he does on Earth, he'll return home forever. Of course this proves to be a problem when Mangog arrives on Earth to get revenge on Odin.
- Hulk mentions he fought Zzzax before, which is likely a nod or reference to Ultimate Spider-Man episode Exclusive.