History
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Michael McCain joined the island of Krakoa created by the X-Men. While searching for items to pawn, Arclight and Forearm found a gateway which took them to another dimension. There, Forearm was killed and Arclight was spared, ordered to bring a message back to the X-Men. He was resurrected by the The Five, but after the resurrection he grew another pair of arms and started behaving aggressively. Beast went on Polemachus too to advert the Swordbearers to not die there, but was killed too, along with Silver Samurai and Solarr. They all were changed, in the mind and in the powers.[1]
Forearm joined Beast's plan to create more Chimeras. They created the Dark Riders and tried to convince Mister Sinister to join, but Sinister refused. In his place, Sabretooth joined the Dark Riders. Then they kidnapped Sinister and Jubilee. When Wolverine came to search for Jubilee, they kidnapped him too.[2]
The Dark Riders were to extract Jubilee's DNA when the X-Men entered in the laboratory and Professor X revealed the truth about Jubilee's powers.[3]