Wanted to quickly update everyone on the situation.
1) We've identified and removed all accounts associated with the spam.
2) We've removed all comments associated with those accounts.
3) The spammers were able to comment on scheduled episodes but were unable to access the content of those episodes - looking into this issue further, we are going to either de-activate the ability to leave comments on scheduled episodes or going to implement counter measures to ban accounts that are commenting on scheduled episodes. Gaining access to these episodes was achieved through scripting.
4) We are looking into implementing velocity based counter measures - i.e. if an account is commenting over X times in Y minutes.
Hope that clarifies the situation. We apologize for the inconvenience and are working on solutions to combat against this.