Not even Loki can stop you from throwing the best birthday ever when you order Avengers Party Supplies from Birthday Express. Invite Captain America, Iron Man, Thor, the Incredible Hulk and the rest of the team to your little superhero’s celebration! Speaking of superheros … you’ll be the hero of the day with these Avengers birthday party ideas! Invitations – Invite friends and thank them for coming with Avengers Assemble Invitations & Thank-You Postcards. Inside each invitation you could add Avengers Assemble Tattoos which are non-toxic and easy to apply and remove. With each thank you card you could include…