A heart parasite was featured prominently in the episode "In Which We Meet Mr. Jones". It wraped itself around Mitchell Loeb's heart, giving him strained heart papultations. After the Fringe Team visits David Robert Jones in prison, he tells them how to kill the parasite in exchange for the words "Little Hill". Jones escapes prison shortly afterwards using Walter's teleportation device.


  • The Heart Parasite may be based on real life Heartworms a common affliction for dogs

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