creator's apparent death. In the episode "Return of the Spider-Slayers", Spencer's son Alistair joins the Kingpin, recreates the Black Widow, and builds the "Tarantula" and "Scorpion" Spider-Slayers, which are able to combine together. In the episode "Tablet of Time", Alistair creates the "Mega Slayer", a heavily armed android he can operate remotely. In the episode "The Ultimate Slayer", as punishment for his repeated failures, Kingpin's chief scientist Herbert Landon genetically mutates Alistair into the Ultimate Spider-Slayer, giving him organic laser guns growing from his shoulders in addition to superhuman strength and resilience. Alistair eventually breaks free from the Kingpin's control after Spider-Man helps him discover that Spencer is still alive and Kingpin placed him in cryogenic suspension. In the episode "The Wedding", the Kingpin uses a duplicate of the Mega Slayer to stop Goblin Glider-riding robots sent by Alistair and the Green Goblin from crashing Peter Parker and Mary Jane Watson's wedding, though it is destroyed while helping Spider-Man and Black Cat. The show was also supposed to feature the "Alien Spider Slayer", which was released as part of the series' tie-in toy line and also served as a boss in the series' video game adaptation, but was cut for unknown reasons. A Spider-Slayer like concept called the Sentinel Prowlers appear in Wolverine and the X-Men. The Sentinel Prowlers are a prototype version of the Sentinels. The Spider-Slayers appear in Ultimate Spider-Man. These versions are creations of HYDRA and Doctor Octopus, who combined Spider-Man's DNA with Arnim Zola's Synthezoids. The group consists of Kaine (voiced by Drake Bell), Scarlet Spider (voiced by Scott Porter), and the Delta-Nine Synthezoids: Bone Spider, Goliath Spider (both voiced by Imari Williams), and Ghost Spider (voiced by Roger Craig Smith). Kaine is an imperfect Synthezoid who is highly resistant to damage, can reattach lost limbs, and feed off Spider-Man or the other Spider-Slayers' life energy. Scarlet Spider, later named Ben Reilly by May Parker, is an almost perfect clone of Spider-Man barring a facial scar and powers. Bone Spider has claws and spikes all over his body; Goliath Spider is the strongest Spider-Slayer who can turn his body into metal; and Ghost Spider can teleport, become intangible, and generate bio-electricity. Scarlet Spider is introduced in the two-part episode "Hydra Attacks" and becomes an ally of Spider-Man and the Web Warriors before eventually being revealed as a spy for Doctor Octopus, though he soon redeems himself.