Snowgre was worried. He was thinking about what Fiona had seen in her dream. He was unaware that it would come true sooner than they thought. Igna watched as a figure followed them into the Dark Forest for the final ingredient. It was the blood of a beetle. But suddenly someone appeared. "Who's that?" Puss asked as the stranger came forward from the shadows.
"Fiona? What happened to you?" he asked as he stared at her strangely. She laughed at Puss's expression as she glowed with blue light. "You know for an assassin, you're pretty clueless about me!" she cackled as her magic levitated him into the air. "My name is Dark Fiona and everyone shall tremble in my path!" she cackled as she grew stronger. Snowgre then scanned her body with his powers. She was an Altermere, a living copy full of evil. "Puss it's not her! The real Fiona's back at the swamp sick, remember?" he yelled. He nodded. Suddenly he fell to the ground. Dark Fiona had disappeared somewhere. They didn't know she was at the swamp performing the ritual to unleash Fiona's dark powers. "She's going to thank me for this!" she cackled as dark energy filled the room. Suddenly fiery red markings were over her skin. "That's good! The ritual's complete!" she said.
She then vanished from sight. Igna laughed at this. The copy had done her job by unleashing Fiona's dark powers. "Now we can watch as she wrecks everything she cared about!" she said to it evilly. But she absorbed the copy. Snowgre and Puss then came back to the swamp and prepared a pot. They put the ingredients in it and cooked them. Snowgre then recited a spell to unleash the goodness of the potion.
When it was ready, he gave it to Shrek and Fiona. They were completely cured of the flu. But he could tell something was wrong. There was darkness in Fiona's eyes. They felt bad magic from her and were worried. "What's wrong?" she asked confused. Suddenly she cackled evilly and a blast of powerful magic shot out of her hands. It hit Snowgre. "Stop before you hurt somebody you care about!" Puss told her but she turned him to stone. Shrek was nervous at this. She then imprisoned him in a cage. He was really worried for her. Dark magic had gotten into her and it was hurting everything she cared about.
"Fi! Listen to me! You've got to fight the darkness within you! Everything is going to be destroyed and you can stop it!" he told her but it enraged her. She then gagged him but hit him with magic.
But then she fell to her knees in pain. "Get out of me, foul demon! You're making me hurt those I care about and I don't want to!" she said through tears. Shrek then reached out a hand towards her but she ignored it. "Foolish wench! She knows this is her destiny and she can't stop it! The one you love has gone! I'm your wife now!" she said to him. Pain throbbed in him especially in his heart. It felt like breaking. "Please don't do this! The one I love hasn't gone! She's being trapped by you and soon she'll be free!" he said bravely.
He knew he had to keep hoping that his wife was in there somewhere. She needed to be freed and soon!