Life was really quite funny. One day, everything was as normal as possible. The next, the Doctor had gone from a white haired gentleman into a bohemian brunet. But life was change and Sarah Jane could accept that. Odd day aside, she was ready to get back out into the universe. If only the Doctor could resist making poor Harry Sullivan look like a fool.
"Doctor." Sarah nudged as a warning before she doubled over, clutching at her stomach much to the worry of the two men.
"Sarah?" They both asked, rushing towards her.
"I'm fine. I'm fine." She waved off before she stood upright. Instantly, she noticed something was very wrong, most notably that she was now level with both her friends.
"Oh dear." The Doctor gasped before he turned to Harry. "Have I gotten shorter in my new regeneration? My second body was a bit shorter than normal I grant you but I don't think a physical change should take quite this long-"
"Or do you maybe think that Sarah Jane is growing? The effects that caused K-1 to grow might have had a delayed effect on Sarah's human biology?" Harry asked.
"Yes. That's probably it." The Doctor smiled before he turned to the now 10 foot tall girl, "We should probably get you outside."
"You think?" She asked before ran out of the lab, feeling her clothes starting to rip, rushing past the shocked UNIT agents, emerging outside at 15 feet tall, her clothes shreeded.
"Oh. Well that seemed a bit premature." She noted before she suddenly felt herself shooting up to 20 feet, the remains of her clothes falling all around her.
"You know Harry," The Doctor said in a far too casual tone as Sarah continued to grow "I owe you an apology. It appears you were quite on the mark about Sarah's growth." The medical doctor didn't answer, too focused on the now 40 foot Sarah's breasts. "Harry?" The Doctor asked, snapping his fingers, "I'm giving you a rare compliment. You should take it."
"Doctor what is the meaning of-" The perpetually irate voice of Brigadier Lethbridge Stewart began before he trailed off, noticing the 50 foot tall and naked Sarah Jane Smith who smiled awkwardly as she tried to cover up her breasts.
"Well it's quite clear that Sarah Jane is now ten times taller than she normally is." The Doctor casually remarked. The Brigadier rubbed his temples as he tried to fight off a migraine. "I'm going to leave you to this and quarantine the area." He muttered as he went back inside.
Sarah rolled her eyes as she knelt down, one arm still trying to hide her breasts from Harry. "So any ideas?" She asked.
"None." The Doctor instantly replied, shaking his head. "It will take some time in the lab." Without missing a beat, he smacked Harry upside the head, shaking him out of his lusty trance. "Come along Harry. Back to the lab."
"What am I supposed to do!?" Sarah snapped, shooting back up to her full height before covering up her breasts when Harry's eyes returned to them.
"Just wait here." The Doctor waved off before dragging Harry back into the building.
"Well isn't that just wonderful." Sarah deadpanned. "Just wait here. Wait here while you've inexplicably been turned 50 feet tall. Your naked body exposed to every pervert in the base." She grumbled as she began walking off, unknowingly exposing her tank sized pale ass to the base and all the cameras inside.
Lost in thought, Sarah wasn't paying any attention to her surroundings and didn't notice herself falling into a pond until it was too late, the water not even reaching up to her belly button. "Well how could this get any more embarrassing?"
Her request was answered as she let loose a small, to her, fart and every dweller of the lake suddenly emerged dead on the surface. "I had to ask." She muttered.
What happens next?
1) Sarah is kidnapped by Rose Tyler who was trying to shrink the Doctor's most important companions out of jealousy. As the dumb blonde tries to figure out how to salvage her evil plan, Sarah is dumped in a cell with an equally large and naked Clara Oswald.
2) Sarah was supersized by the Time Lords who intend for her to be the Doctor's weapon on his mission to avert the Daleks' creation.
3) Something in the water causes Sarah to get even bigger.