just by saying 'effervescence'

“Aren’t you hot? Besides being hot.” Trini murmured as she splayed her hand softly against Kimberly’s sternum, feeling the sweat through the thin fabric and the quick intake of Kimberly’s breath.  She frowned and wagged her head, stopping it immediately.  “Owh.” she groaned, and her hand slid lower.  “Live!” She began fumbling to open the first button of the blouse, desperate for her to properly breathe.

“I-I’m properly breathing.” Kimberly’s hands trembled as she pried Trini’s own and set them on her lap.

”You’re breeding erratically.” Trini protested.  She cleared her throat.  “Briefing.  Breathing.”

”Mom?” Kimberly whimpered.

”Yes? Does Trini have her seatbelt on?” Mrs. Hart asked.

“Yes…”

“Great!”

“Mom, I’m bi.”

“I know, child.  Make sure Trini is comfortable.”

“When will the anesthesia wear off?”

“I suppose in a few hours.”

Kimberly sighed.  Trini frowned and cupped Kimberly’s face.  “What made your sadness?” she asked.  “It’s me? Tell me what I do…”

“It’s not you.” Kimberly soothed.  “You’re just high.”

“But! Never?” Trini leaned close to Kimberly as far as her seatbelt allowed, almost bumping her mouth on her chin.  “Can you breathalyzer?”

“No.” Kimberly’s laughter sounded like she was weeping.  

“I’m not funny! You–you are, you look p-p-p-pink, like,” Trini snapped her fingers, just as Kimberly would do, “when you morph into–”

“My bathing suit?” Kimberly said.  “Right?”

“No but okay.” Trini raised her arms.  Kimberly laughed again, and she smiled even if her mouth still felt numb, propping her chin on the back of the car, trying to absorb it all.  “Gosh.” she sighed.

“What’s up, Trini?”

“You.” Trini murmured.  “You.”

“Me?”

“Effervescent.”

“Did she just say a big word on anesthesia?” Mrs. Hart asked behind the wheel.  “Wow.”

“I love you so much it hurts.” Trini said.  “Like uh, uh, I dying star but feel like baby star? Yeahah.” She nodded seriously.  “Legit.  It’s lit.”

Kimberly’s breath caught, her eyes widened, and she seemed to petrify so, so slowly.

Article from Radio Times announcing Maureen O’Brien coming to Doctor Who, December, 1964.

Vicki is my favorite TARDIS crewmember ever, because she was the first in the modern mold: she was lively, energetic, bubbly, and had way better chemistry with the rest of the cast than the actress she replaced. That’s not a slam, chemistry is unpredictable - and people just light up when Vicki entered the scene, just watch the actors’ faces. It’s no exaggeration to say Vicki’s effervescence shifted the tone of the show (Doctor Who episodes before her were vaguely ponderous and Outer-Limits-ish).

With all due respect to the original three TARDIS crewmembers, who were all great, their group dynamic was a false start that was never really duplicated. In the long term of the show, Vicki was the one from that era that mattered. To use an evolutionary metaphor, Vicki was the “common ancestor” of the modern companion: she had pluck Susan didn’t have (Susan was never reliable in a crisis),  took initiative, suggested ideas, and even took charge at times. You can see a straight line of descent from Vicki all the way to TARDIS crew members like Sarah Jane Smith and today’s sidekicks.