When Jack heard about what the slither were planning, he went down there immediately. He took Donna with him, she wasn't taking "no" for an answer. They arrived at the hospital 40 minutes later, meeting Sarah Jane in the waiting room with the others. Jack asked where Martha was and Sarah Jane was confused, she had only met her once, even then she didn't really meet her properly. ("Journey's End")
Before Luke could stop himself, he blurted out "she's in there with The Doctor" pointing, then quickly pulling his arm down, his cheeks going red. Everyone looked at him in surprise except for Jack, he knew of course.
They weren't standing there for long, when a small explosion ad gone off near the entry. The doors were sealed closed and the hospital was almost empty, no one had heard it go off. They all fell to the floor from the impact, quickly getting up and running down the hall. They came to a stop when they found themselves in a cross of hallways. There were 4 different halls and none of them could remember which one they came from, they all looked the same.
Everywhere they looked, they could see white plain walls with lights on the side. The Slitheen were coming closer, they could hear it. They were desperately looking for where the sound was coming from, when they saw Martha walking down the hall after seeing a glimpse of Jack. She started to do a slow jog, looking to her left and right every now and then. She asked Jack about the explosion, not seeing anyone else there. He told her it was Slitheen and she looked at him like he was crazy. Rani stepped in and hurriedly explained what a Slitheen was, Martha looked at the small group and nodded in a friendly way without a smile to each of them.
A Slitheen came wandering down the hall with a small device that was wirelessly connected to three different bombs. He was in his true form, the tall green creature, standing high above them, about 5 meters away. He pushed a button and they heard another bomb go off, they jumped and he was dancing on the spot happily. He had to left and the one big, red button in the middle was most likely the big, big bomb that was said to blow up the whole hospital, killing all the patients. The Slitheen pressed another button, making another bomb go off, when Amy and Rory decided to join them. No one really noticed they were there, they were too scared worrying about the big bomb about to go off.
"I'll finish all of you off, and then, I'll create an even bigger bomb and kill the entire human race"
The Slitheen said with a laugh, so close to pressing the big, red, glowing button, when someone stepped in between them, raising a glowing green screwdriver.