Masked Girls Everywhere!

 is the tenth episode of the fourth season of Star Teens Unite!.

Summary
At home, Ella, her mother Trixie, her young sister Julie, and her friends, are wearing their masks, when the whole world is spread by mysterious deadly particles that everyone in schools and even Arco Iris are forced to wear masks to ward them off.

Major Events

 * Global pandemic in the world and Arco Iris

Characters

 * Ella
 * Inidra
 * Sandra
 * Felicia
 * Lisa
 * Tanya
 * Sheila
 * Julie (Ella's younger sister)
 * Trixie (Ella's mother)
 * Debbie (Inidra's mother)
 * Samantha (Sandra's mother)
 * Paul (Sandra's younger brother)
 * Judith (Felicia's mother)
 * Daphne (Lisa's mother)
 * Elena (Tanya's mother)
 * Antonio (Tanya's younger brother)
 * Maya (Tanya's younger sister)
 * Heather (Sheila's mother)
 * Ms. Diana Apple
 * Nurse Penny Harrison
 * Miss Addison
 * Veronica
 * Stinky
 * Eileen Kimball
 * Daisybelle and the fairies
 * Nemo
 * Queen Coral
 * Maris
 * Killer particles

Voice Cast

 * Aimee Carrero - Tanya
 * Alana Ubach - Antonio
 * Ariel Winter - Julie, Nemo, Fairy
 * Ava Acres - Fairy
 * Colleen O'Shaughnessey - Trixie
 * Cree Summer - Heather
 * Grey Griffin - Sandra, Samantha
 * Isabella Acres - Fairy
 * Jennifer Hale - Veronica
 * Jessie Flower - Maris
 * Jodi Benson - Queen Coral
 * Julie Nathanson - Miss Addison
 * June Angela - Daphne
 * Kari Wahlgren - Ella
 * Kate Micucci - Inidra
 * Kath Soucie - Debbie, Paul, Nurse Penny Harrison
 * Kimberly Brooks - Sheila
 * Madison Pettis - Daisybelle
 * Mae Whitman - Stinky
 * Maria Canals Barrera - Elena
 * Michaela Zee - Fairy
 * Nika Futterman - Maya
 * Tara Strong - Felicia, Judith
 * Veronica Taylor - Eileen Kimball
 * Vyvan Pham - Lisa

Trivia

 * Everyone in this episode, even in Arco Iris, are wearing face masks throughout---basically due to killer particles spreading!