Merlin brought them all back to the barn. The crack was still there and it seemed as if no time had passed since they left. Merlin turned and strode resolutely towards the crack. "If you two aliens wish to return home, now is the time to do it," he said firmly.
"We don't take orders from you, boy," Korst Fex Fotch said scornfully.
"Have it your way then," Merlin said.
"Merlin, what are you doing?" the Doctor asked. "Don't do anything rash."
Merlin did not reply but stood facing the crack. He stretched his arms out and began to speak a spell. His voice grew deep and resonated with power, and his eyes blazed. The light emanating from the crack began to writhe and looked as if it was fighting him but Merlin's expression indicated that he would not tolerate it – he would make it bow to his will; he would not have it any other way.
The light grew brighter and brighter as it fought against Merlin's control. But all of a sudden, it seemed to give up and receded. The barn went dark. Merlin relaxed and turned away. "Is it over?" he asked the Doctor.
The Doctor took out his sonic screwdriver and checked the wall. "No. It seems the crack is still there…"
As he spoke, there was the barn began to shake harder and harder.
"Time to make a move, I think," Dram Gogg Thek said, retreating out the door with Korst Fex Fotch.
"Is it an earthquake, Doctor?" Amy asked.
The Doctor looked terrified: "No, explosion! Out, everybody out!" He grabbed Amy and pushed her towards the door. But Merlin did not move. "Merlin! Come on!"
"I can handle this," he said calmly. He positioned himself before the crack, which was beginning to glow white again. "Go, Doctor."
The Doctor was uncertain and did a little dance with his feet trying to decide whether to stay or to go. The light was growing brighter and, before the Doctor could decide, burst out in an explosion. The sound was like a tornado with a thousand winds blowing in every direction. Merlin threw both hands out as if to ward off the light and the light stopped abruptly as though it had hit an invisible wall. Merlin's power drove it back and once again, everything went dark. The crack had disappeared. Silence reigned.
"You've done it, Merlin!" the Doctor exclaimed and ran forward, pulling Merlin into a hug. However, around them, the building was now collapsing. Ceiling beams were crashing down and they were still in real danger. "Right, time to get out now." He grabbed Merlin and made a beeline for the door. They escaped just as the barn fell in on itself.
Outside, Amy threw herself onto the two men and hugged them tightly. "Don't you ever do that again!" she scolded. "Don't you ever!"
"Alright, ok, Amy, got to breathe," the Doctor gasped and Amy let him go. "Where are our two Slitheen?"
Amy pointed to them standing a distance away. The Doctor strode over. "It's over now," he said. "The crack is sealed, and with it your way home."
"We realised," Dram Gogg Thek said. "It seems the decision to shut down our business was never ours, Doctor. All your arguments were never meant for us. In the end, even if we did shut down the business, we did not have the power to close the crack, and your friend has."
"What will you do now?" the Doctor asked.
"Go back home, I suppose," Dram Gogg Thek replied. The Doctor looked alarmed. "Oh, don't look so startled, Doctor. We do have teleports that can get us back to Raxacoricofallapatorius where we can start again in a new time. We businessmen will get by."
"Fine," the Doctor said. "I'm letting you go this once. But you're not to come back again. I don't think I need to enforce this. Merlin will take care of it."
"We are not parting on cordial terms, Doctor," Korst Fex Fotch said. "But we are businessmen and we can be civil. So farewell, and I hope we never see each other again."
With that, the two Slitheen disappeared in a burst of light. "And good riddance," the Doctor said under his breath.