Okay, that Possessed Vampire Doll is from a comic book called Lenore the Cute Little Dead Girl. But you can go to YouTube and watch little videos, I guess it would be a mini episode but it was never on T.V. Each one is about two minutes long. Anyway the Possessed Vampire Doll, his name is Ragamuffin. He was a vampire that had eaten a witch's sister and she put a curse on him that turned him into a doll and only a drop of blood would break the curse and Lenore, which is a dead little girl, she poked her finger and a drop of blood fell on Ragamuffin. But since Lenore is dead and she had embalming fluid in her blood, when she bled on him it only made him be able to walk around, talk, eat, drink and the likes. I would've said that "It made him live again" but I doubt that would be very accurate. Anyhow now he is just a vampire trapped in a plush doll body. So, the banner is Dib finding Ragamuffin and showing him to Gaz, who is annoyed, probably buy simply hearing his voice.