In the not so distant future, Theodore, a lonely writer, purchases a newly developed operating system designed to meet the user's every need. To Theodore's surprise, a romantic relationship develops between him and his operating system. This unconventional love story blends science fiction and romance in a sweet tale that explores the nature of love and the ways that technology isolates and connects us all.
Joaquin Phoenix
as Theodore
Scarlett Johansson
as Samantha (voice)
Lynn Adrianna
as Letter Writer #1
Lisa Renee Pitts
as Letter Writer #2
Gabe Gomez
as Letter Writer #3
Chris Pratt
as Paul
Artt Butler
as Text Voice (voice)
May Lindstrom
as Sexy Pregnant TV Star
Rooney Mara
as Catherine
Bill Hader
as Chat Room Friend #2 (voice)
Kristen Wiig
as SexyKitten (voice)
Brian D. Johnson
as OS1 Commercial Lead
