A young girl who goes through a difficult experience begins to see everyone's imaginary friends who have been left behind as their real-life friends have grown up.
You can now watch IF online on the following streaming providers in the United States.
| Directing | John Krasinski | Director |
| Production | John Krasinski | Producer |
| Writing | John Krasinski | Writer |
| Production | Allyson Seeger | Producer |
| Production | Andrew Form | Producer |
| Production | Ryan Reynolds | Producer |
| Production | George Dewey | Executive Producer |
| Camera | Janusz Kamiński | Director of Photography |
| Sound | Michael Giacchino | Original Music Composer |
| Editing | Christopher Rouse | Editor |
| Editing | Andy Canny | Editor |
| Production | John J. Kelly | Executive Producer |
| Art | Jess Gonchor | Production Design |
| Crew | Louis Gossett Jr. | In Memory Of |
| Production | Tricia Wood | Casting |
| Production | Jennifer L. Smith | Casting |
| Crew | Mandy Moore | Choreographer |
| Production | Alexa Ginsburg | Co-Producer |
| Production | Kimberly Nelson LoCascio | Executive Producer |
| Production | Jess Kidd | Co-Producer |
| Production | Michael Lerman | Co-Producer |
| Costume & Make-Up | Jenny Eagan | Costume Design |
| Visual Effects | Arslan Elver | Animation Supervisor |
| Visual Effects | Chris Lawrence | Visual Effects Supervisor |
| Directing | Michael Lerman | First Assistant Director |
| Directing | Woodrow Travers | Second Assistant Director |
| Production | Randy Manion | Unit Production Manager |
| Production | John J. Kelly | Unit Production Manager |
| Crew | Mark Pettograsso | Stunt Coordinator |
| Crew | Kyle Woods | Stunt Coordinator |
| Crew | Mike Gunther | Stunt Coordinator |
| Sound | James Mather | Supervising Sound Editor |
| Sound | Mike Prestwood Smith | Sound Re-Recording Mixer |
| Sound | Mark Taylor | Sound Re-Recording Mixer |
| Sound | Brandon Proctor | Sound Re-Recording Mixer |
| Sound | Lee Salevan | Sound Re-Recording Mixer |
| Sound | Ethan Van der Ryn | Supervising Sound Editor |
| Sound | Erik Aadahl | Supervising Sound Editor |
| Production | Jeff Robinson | Associate Producer |
| Production | Lori Scowley | Associate Producer |
| Crew | Lori Scowley | Production Controller |
| Art | Christopher J. Morris | Supervising Art Director |
| Art | Kris Moran | Set Decoration |
| Art | Zack Gonchor | Art Direction |
| Art | Adam Mull | Set Designer |
| Art | Mattie Siegal | Assistant Set Decoration |
| Art | Ashley Wellbrock | Assistant Set Decoration |
| Art | Timothy Metzger | Leadman |
| Camera | Matthew Moriarty | "A" Camera Operator |
| Camera | Matthew Moriarty | Steadicam Operator |
| Camera | Connie Huang | "B" Camera Operator |
| Camera | Lonny Danler | Digital Imaging Technician |
| Camera | Sean P. Gilbert | Underwater Camera |
| Camera | Meg Kettell | Second Unit Director of Photography |
| Directing | Brooke Satrazemis | Script Supervisor |
| Editing | Jay Rabinowitz | Additional Editing |
| Editing | Mark Fitzgerald | First Assistant Editor |
| Editing | Bryce Madden | Assistant Editor |
| Crew | Jordan Lindblad | Visual Effects Editor |
| Crew | Chris Clemente | Post Production Supervisor |
| Sound | David J. Schwartz | Sound Mixer |
| Sound | Graham Gardner | Boom Operator |
| Sound | Allison Howe | Boom Operator |
| Sound | Janek Finn Pfeffer | Boom Operator |
| Art | Bruno F. Panacciulli | Construction Coordinator |
| Visual Effects | Conrad V. Brink Jr. | Special Effects Supervisor |
| Crew | Jeff Brink | Special Effects Coordinator |
| Crew | Ken Robinson | Thanks |
| Sound | Curtis Green | Conductor |
| Crew | Curtis Green | Additional Music |
| Sound | Jeff Kryka | Orchestrator |
| Visual Effects | Craig Crawford | Visual Effects Supervisor |
| Visual Effects | Jeremy Beadell | Visual Effects Producer |
| Camera | Jonny Cournoyer | Still Photographer |
