2 Works in Underdog (Cartoon)
Thor stops by to bring the others to come visit a city with him and his little sister to meet a superhero known as Underdog as he must go up against his arch enemy: Simon Bar Sinister. Meanwhile, Krypto the Superdog is asked by the Dog Stars to find Underdog and recruit him to join their patrol as a fellow canine superhero and maybe even become new friends.
Summary: Talking dogs should probably be the least of their worries, but, there you go.
Disclaimer: I own nothing either in regard to The Avengers or Underdog. Sadly.