DISCLAIMER
Both shows belong to the WB. The Shadow King belongs to Marvel Comics, though I own some of his powers.
"Sammy!" Dean yelled. He and the others ran towards him.
"CRISTO!" Sam bellowed. Angel and Spike flinched, and the others saw the fog-like shadow move back.
"Bloody heck, warn us next time," Spike grumbled. Sam continued to repeat the word, until suddenly, he made a choking sound. Buffy and the others quickly took up the mantra, until they too were under the same influence. All the while, Sam was trying to move towards the others in an attempt to fight the hold. Dean stretched out to grab Sam. Come on, almost there, he thought. Sam grunted as he also stretched out towards Dean. The doors to the Magic Shop burst open and Sam flew out. The older Winchester made groaning sounds until finally, his voice was given back.
"No!" Dean cried. "Sammy!" he continued as the doors banged shut. Sam lay on the ground, partly held by the Shadow King, and partly hurting from the impact of the fall. The Shadow King dove in and Sam groaned. No. Can't let him, he thought. He opened his mouth and tried to say the word that would dispel him, but his voice still wasn't working. He panted shakily. He could feel this freak moving through him, suffocating his soul, trapping him, taking over. His lips moved in a silent attempt, but it had no effect. No! Sam's mind howled. Then it was over. Sam stood up. He began to laugh. But it wasn't Sam's laugh. Instead, it was a deep laugh, full of malice. His once hazel eyes shone a brilliant red. The Shadow King had taken over.