"Mary Kay Place as Grandma Bea, Emma's supportive grandmother who raised her when Emma's parents kicked her out of their house for coming out to them."

"Logan Riley Hassel as Kaylee, Alyssa's cheerleader friend who disapproves of Emma taking a girl to prom and has a small tattoo on her wrist."

"Nathaniel J. Potvin as Kevin Shield, Shelby's boyfriend."

"Tracey Ullman as Vera Glickman, Barry's mother."

"Kevin Chamberlin as Sheldon Saperstein, Dee Dee and Barry's publicist."

"— Gordon Lighthouse"

"Blue Chapman — Sam Gillman"

"— Grandmamah"

"— Chelsea Van Der Zee / Queen Nerissa"

"Lana Condor — Ruby Gillman"

"— Agatha Gillman"

"Sam Richardson — Brill Gillman"

"Discover the hero just beneath the surface."

"— Arthur Gillman"

"You’ll never win, Ruby Gillman! You're just a DUMB teenager! You know what’s really pathetic? That you thought someone like me would EVER be friends with a MONSTER LIKE YOU."

"I'm Chelsea."

"Hellooooo? Is Mrs Gillman home? Knock-KNOCK!!!"

"I am gorgeous!"

"[to Nerissa] Leave my sister alone!"

"Your mom chose her own path. She chose you."

"Mermaids are selfish, vain narcissists."

"Daughter? Nerissa never had a daughter."

"Camouflage. Super speed. Body armor. Let's see what you're capable of."

"You have powers beyond your imagination."

"[in trailer] No matter what the challenge, a kraken will always answer the call."

"Princess Ruby has finally returned home to be my successor."

"Love you, too, rando!"

"The women in our family have the mighty power to turn into giant kraken."

"The ocean is a mysterious world. Humans know more about the surface of Mars than the floor of the ocean. And the sea creatures who live there? Well, even the ones you have imagined, you imagined them wrong. Take the mighty, giant kraken. Bloodthirsty monster, sinker of ships. Where are you even getting this? Krakens are majestic creatures and noble protectors."

"I know it's a lot to take in, but you're not alone. I turn into a giant kraken too. [Ruby: What? What?!]"

"Stay away from my daughter! [Grandmamah: You mean my granddaughter?]"

"I just wanna be Ruby Gillman, normal teenager."

"This whole time we have been hiding from monsters, it turns out I'm the monster."

"Sorry, tadpole. Mom's right."

"I'm a mother-flippin' mermaid!"

"I think... I am having a panic attack!"

"[to Brill] I don't even know you!!"

"[to Nerissa] Stay away from my mother!"

"Let's all have a very "human" day!"

"I'm just Ruby Gillman, normal teenager."

"[in trailer] I know your secret. You're a kraken, hiding as a human. And soon, everyone will know the truth. Kusjes!"

"Grandmamah. I want you to teach me how to use my powers."

"[in trailer] It's time... to go big!"

"I'm not gonna hide… anymore!"