Disney Channel has added three to its upcoming TV movie “Invisible Sister,” starring “Girl Meets World” starlet Rowan Blanchard and Paris Berelc from Disney XD’s “Mighty Med,” Variety has learned.

Karan Brar, known from the hit series “Jessie” and set to star in the newly announced spinoff, has been cast, along with Rachel Crow (“The X Factor”) and newcomer Austin Fryberger.

The Disney Channel Original Movie follows Cleo (Blanchard), whose science project goes terribly wrong, causing her popular sister Molly (Berelc) to become completely invisible.

Brar will play Cleo’s best friend and fellow science whiz kid George; Crow will play Molly’s best friend and teammate, Nikki; and Fryberger has been cast as “the Coug,” Molly’s goofy but affable boyfriend.

The comedy adventure pic was written by Jessica O’Toole and Amy Rardin (“Greek,” “The Carrie Diaries”), and Matt and Billy Eddy (“Teen Beach 2,” “Bad Hair Day”). It will be directed by Paul Hoen (“Camp Rock 2: The Final Jam,” “How to Build a Better Boy”) and exec produced by Sheri Singer (“Halloweentown,” “Girl vs. Monster”).

“Invisible Sister” is one of four upcoming Disney Channel Original Movies that Disney Media Sales and Marketing will present as a cross-platform sponsorship opportunity at this year’s Kids Upfront.

Blanchard’s “Girl Meets World” co-star Sabrina Carpenter is leading another DCOM, “Further Adventures in Babysitting,” which is based on the 1980s film “Adventures in Babysitting.”

“Invisible Sister” goes into production this spring and is set to premiere this fall on Disney Channel.