I think you ought to know I'm feeling very depressed.
At the end of the villain turn for Citizen Anvil, it says "If citizen hammer is in the villain trash, put him into play". Assuming Citizen Hammer is in the trash and I bring it back. Citizen Hammer end turn says "This card deals each hero target a 3 Fire damage". Do I get to play this action in this turn or on the next?
Yes, you are still in the end of turn phase.