Meet the Cast of IF: All the Stars Voicing Characters, from Blake Lively to Steve Carell

Ryan Reynolds as Cal

Ryan Reynolds, who returns as Deadpool in Deadpool & Wolverine this summer, stars in the film as Cal, Bea's neighbor who can see IFs. Together, they work together to reunite the IFs with their former kids. In addition to starring in the project, Reynolds also produced the film alongside Krasinski. 

Reynolds spoke with PEOPLE about IF at the film’s premiere in New York City, noting that his children were super excited to tune in. During an appearance on the Today show, Reynolds added this his daughter Betty has imaginary friends of her own, noting that she had “a very vivid imagination.”

Cailey Fleming as Bea

Cailey Fleming, 17, stars in the movie as Bea, a young girl who gets the ability to see imaginary friends after going through a troubling experience. During the premiere, Reynolds praised his costar, joking that his children “worship” Fleming and she was easily their top choice to babysit them among the cast. 

Before IF, Fleming got her breakout playing young Rey in Star Wars: The Force Awakens, a role she reprised in Star Wars: The Rise of Skywalker. Like Reynolds, she is no stranger to the MCU, having previously played a Young Sylvie in Disney+’s hit series Loki. 

John Krasinski as Bea’s Dad / Marshmallow Man

John Krasinski is pulling quadruple duty for IF, as the director, writer, producer and one of the stars. In addition to playing Bea’s dad, he also voices the character Marshmallow Man. 

Similar to how Krasinski penned A Quiet Place as a “love letter” to his daughters, the Office alumnus was inspired to write the upcoming children’s film because of his girls. "I made this movie for my kids," he told CBS Mornings noting that the story stemmed from watching his kids amid the COVID-19 pandemic. 

"I saw their light starting to go out. And I saw that the world started to seep in, and that is the definition of growing up," Krasinski said. "I just called everyone up and said 'Listen, you have no reason to do this. It's a movie about imaginary friends. It's also helping kids cope with growing up and stuff like that.' And I said 'If you want to do it, great.' I've never had quicker yeses in my life."

Steve Carell as Blue

The new film features a sweet The Office reunion between Krasinski and Steve Carell, as the latter voices the character Blue, a creature who helps Cal and Bea with their quest. “Blue is played by Steve Carell who happens to be a dear friend,” Krasinksi said of his former costar in a behind-the-scenes clip. 

"Oh my God, The Office reunion we've all been waiting for is in it," Krasinski told Entertainment Weekly of the film. "The truth is, Steve's one of the most talented people on the planet. So whether I had ever worked with him before or not, I would've been gunning for him because I just had his voice in my head when I was writing Blue."

Phoebe Waller-Bridge as Blossom

After making audiences laugh with her starring role on Fleabag, which she also created, Phoebe Waller-Bridge lends her voice to Blossom, a butterfly creature who was previously the imaginary friend of Bea’s grandmother.

Louis Gossett Jr. as Lewis

The late Hollywood legend Louis Gossett Jr. voices Lewis, an elderly teddy bear. The film marks one of his final roles following his death in March 2024 at age 87. 

The actor had an illustrious career that spanned film, TV and Broadway. His most notable roles included Roots and An Officer and a Gentleman, the latter of which earned him an Academy Award for Best Supporting Actor — making him the first Black performer to win the Supporting Actor Oscar.

Emily Blunt as Unicorn

Krasinski turned IF into a family affair as his wife Emily Blunt voices the character Unicorn. Blunt recently showed her support for Krasinski as they stepped out for a date night at the film’s premiere. Similar to Reynolds sharing the screen with his wife Lively, Krasinski told PEOPLE that his children were excited to see Mom and Dad in a movie together. "For our kids to have their mom in the movie too was so massive. It was a family affair," Krasinski said.

While Blunt is well-known for her roles in The Devil Wears Prada, Mary Poppins Returns and recently Oppenheimer, this isn’t her first time sharing the screen with Krasinski. The two previously teamed up for A Quiet Place and its sequel A Quiet Place Part II, where they played a husband and wife raising their children in a post-apocalyptic world terrorized by aliens.

Matt Damon as Sunny

Matt Damon voices the character of Sunny, a pretty flower. Damon was also in attendance at the IF premiere, calling Krasinski a “very good friend” as he spoke with ScreenSlam. “This movie has got so much of him in it and it’s got such a beautiful message,” he added, saying it was a “pleasure” working with him.

While Damon is known for his action-packed films such as the Ocean's films and the Jason Bourne franchise, the father of four has taken on some light-hearted family films through the years, including We Bought a Zoo with Scarlett Johansson.

Maya Rudolph as Ally

Maya Rudolph voices a character named Ally, who is a pink alligator. During the film’s premiere, she spoke with The Hollywood Reporter, saying that she would personally love to have Phoebe Waller-Bridge voice her own imaginary friend. 

As a Saturday Night Live alumna, Rudolph is no stranger to making our sides ache with her funny characters. In addition to all of her SNL sketches, she is well known for her roles in Bridesmaids and Grown Ups. Plus she is quite the pro when it comes to voice acting, lending her voice to projects such as The Angry Birds Movie, The Emoji Movie and Big Mouth. 

Jon Stewart as Robot

Former Daily Show host Jon Stewart voices the character Robot. Cracking jokes should be no problem for Stewart, who got his start as a stand-up comedian before branching out to television as a host. 

The long-running host of The Daily Show has received numerous accolades throughout his career including various Emmy Awards, Grammy Awards and Peabody Awards.

Sam Rockwell as Guardian Dog

Sam Rockwell voices the character Guardian Dog in the film. Though Rockwell is well known for his dramatic roles including Three Billboards Outside Ebbing, Missouri, Vice and Fosse/Verdon, he has also lent his voice to children’s films such as The Bad Guys and Trolls World Tour. 

Sebastian Maniscalco as Magician Mouse

Sebastian Maniscalco voices the character Magician Mouse, who as the name would suggest is a mouse that poses as a magician. The stand-up comedian is notorious for his physical comedy but has taken on some dramatic roles in the past, including Green Book, The Irishman and About My Father, the latter of which he also wrote. 

Like his costars, he is also no stranger to voice acting. Notably, he voiced the character of Foreman Spike in 2023’s The Super Mario Bros. Movie starring Chris Pratt. 

Christopher Meloni as Cosmo

Christopher Meloni voices the character of Cosmo, who appears to be a private investigator of sorts based on the glimpses in the trailers. Obviously, Meloni is very familiar with playing a law-enforcing character, with his starring role on Law & Order: Special Victims Unit and now Law & Order: Organized Crime.

Meloni has also done voice acting in the past, including the animated Harley Quinn series and the video game Call of Duty: Black Ops III. 

Richard Jenkins as Art Teacher

Richard Jenkins voices the imaginary friend dubbed the Art Teacher. Jenkins is well known for his role on the HBO series Six Feet Under as well as drama films like The Visitor, The Shape of Water and Dahmer – Monster: The Jeffrey Dahmer Story. However, he has taken on some lighter films in the past, such as the 1995 film The Indian in the Cupboard. 

Awkwafina as Bubble

Awkwafina voices the character of Bubble in the movie. Awkwafina has made a name for herself with her various funny roles, including Ocean's 8, Crazy Rich Asians and Awkwafina Is Nora from Queens, which she co-created and wrote, though she has shown off her dramatic chops with films like The Farewell, which earned her a Golden Globe. 

In addition to her long list of acting roles, Awkwafina has done a ton of voice work, including Raya and the Last Dragon, The Little Mermaid, Migration and Kung Fu Panda 4, just to name a few.

Blake Lively as Octopuss

Blake Lively joins her husband Reynolds on the screen as she voices Octopuss, who is shown to be a cat dressed up in an octopus costume. IF marks Lively and Reynolds’ first film together since they costarred in 2011’s Green Lantern.

George Clooney as Spaceman

George Clooney voices Spaceman, who as the name would suggest is an astronaut. Clooney has a decades-long career that spans drama and action films and has earned prestigious awards such as Golden Globe Awards and Academy Awards.

Though he is well known for his dramatic roles in the Ocean's film series, O Brother, Where Art Thou? and The Descendants, he has shown his comedic side with films like Hail, Caesar!, Ticket to Paradise and Spy Kids. 

Matthew Rhys as Ghost

Matthew Rhys voices the character Ghost in the new movie. Rhys gained critical acclaim for his role in The Americans, which also starred his partner Keri Russell. Though he has been inclined to take on more dramatic roles, he has done a number of family-friendly projects, including A Beautiful Day in the Neighborhood and Mowgli: Legend of the Jungle. 

Bradley Cooper as Ice

Bradley Cooper voices Ice, who is a glass of ice water. Like the rest of his costars, Cooper is known for his dramatic roles, such as Silver Linings Playbook, A Star Is Born and Maestro, but has some comedic chops as well.

After getting his start in comedy projects like Wet Hot American Summer and The Hangover, Cooper has notably voiced the character of Rocket in the Guardians of the Galaxy films.

Amy Schumer as Gummy Bear

Amy Schumer voices Gummy Bear in the film who is — you guessed it — a bright red gummy bear. Schumer is synonymous with comedy, having gotten her big break with the Comedy Central sketch comedy series Inside Amy Schumer.

Additionally, she has starred in a number of romantic comedies including Trainwreck with Bill Hader and I Feel Pretty. Currently, she stars on the Hulu comedy series Life & Beth, which she also created. 

Keegan-Michael Key as Slime

Keegan-Michael Key voices Slime, a green blob reminiscent of Flubber from the Robin Williams film. He notably got his big break with the sketch series Key & Peele, which he co-created and costarred in with Jordan Peele, and has taken on many comedic roles since.

Notably, he has done a ton of family-friendly films, including Wonka, Super Mario Bros. Movie, Migration as well as Disney's Toy Story 4 and the live-action remakes of The Lion King and Pinocchio.