<P> Portrayed by Emma Grabinsky as an adolescent and by Jewel Staite as an adult . Amy was a Kitsune who grew up traveling around with her mother . In 1998, they crossed paths with Sam Winchester in Lincoln, Nebraska . Amy killed her mother to protect Sam, with whom she had grown close . Amy re-encountered Sam years later . Sam tracked her down after she committed a series of murders . Amy then reveals that she had only committed the murders to strengthen her sick son Jacob . Given the circumstances, and their history, Sam agrees to let her go and makes Dean promise to do the same . However, Dean later returns and kills Amy . He spares her son, who vows revenge . Dean lies to Sam about Amy's fate but is plagued by guilt . The truth is eventually revealed and is a source of conflict between the brothers for a time . </P> <P> Amy's name is a nod to the Doctor Who character of the same name . </P> <P> Benjamin "Benny" Lafitte (Ty Olsson) is a vampire who was a vampire pirate during his first lifetime until he met Andrea Kormos and fell in love with her, leaving his nest and stopping feeding on humans . He was eventually tracked down and killed by his nest mates and went to Purgatory where he spent around fifty years before Dean ended up there after killing Dick Roman . Benny saves Dean from another vampire and makes a deal with him: in exchange for Dean taking him with him, Benny will show him a portal out of Purgatory . Benny helps Dean find Castiel, warning him that traveling with an angel will get them killed, but Dean is insistent on all of them getting out . After Benny saves Castiel from Leviathans, he earns Dean's full trust and Dean carries him out of Purgatory in his arm . On Earth, Dean travels to Benny's grave and resurrects him . The two remain in touch, but stay separate until Benny goes after his nest for revenge and to protect himself from further attempts on his life . After Benny is injured, he calls Dean for help and together they take down the nest, with Benny killing his maker . However, Benny is reunited with Andrea who he learns was turned into a vampire instead of being killed . She helps him out, but to Benny's heartbreak, he learns that she has changed and wants to take over the pirating operation herself and Dean is forced to kill her to save Benny . Needing something to keep him on the straight and narrow, Benny moves to his hometown of Carencro, Louisiana where he meets and secretly looks out for his great - granddaughter Elizabeth . Rogue vampire Desmond tries to get Benny to join him, but Benny refuses and Desmond leaves a trail of bodies to try to get Benny to agree, drawing the attention of insane hunter Martin Creaser and Sam and Dean . Dean and Benny hunt down and kill Desmond, but Martin tries to kill Benny, using Elizabeth as a hostage . Benny is forced to kill him in self - defense and is left in a deteriorating situation worsened by the fact that Dean soon afterwards cuts off all contact . When Sam gets trapped in Purgatory, Dean goes to Benny for help, knowing he can get Sam out . Benny agrees, telling Dean he feels he no longer fits in on Earth . Dean kills Benny who saves Sam and Bobby Singer from vampires and leads them to the portal out . However Benny, who never intended to return to Earth, stays behind to hold off a group of vampires and allow Sam to escape . Benny is last seen fighting the vampires . Benny finally gains Sam's acceptance with this self - sacrifice and Dean buries his body instead of burning it in hopes of bringing him back one day . </P> <P> Chet (played by Sean Owen Roberts) is a Leviathan stationed at a credit card company . When a flagged alias that was registered by the Winchesters was used, Chet begins to hunt the Winchesters down, tracking them to their hotel room in Prosperity, Indiana . While he easily dominated the brothers, a witch that the Winchesters helped disabled Chet and allowed them to escape . Using copious amounts of chains, the brothers took Chet to Bobby Singers to determine his weakness . </P>

Who plays dean's vampire friend on supernatural