At Harvard

Rollerball. At the Science Center C, Friday at 8 and 10. At Science Center D, Saturday at 8 and 10.

Dirty Harry. At the Harkness Commons Dining Hall, Saturday at 8 and 10.

Enter the Dragon, At the Science Center B, Friday and Saturday at 8 and 10.

The Sparrow. At Hilles Library Cinema, Thursday at 7 and 9:15.

The Wrong Box. At the Kirkland House Dining Hall, Friday and Saturday at 8 and 10.

The Russians Are Coming, the Russians Are Coming. At Lehmann Hall, Friday and Saturday at 7:30 and 10:00.

Metropolis. At the Hilles Library auditorium, Friday and Saturday night.

Voyage to Italy. At the Harvard-Epworth Church, Sunday at 7:30.

Center Screen. Two documentaries on the environmental sculptor Christo, "Christo's Valley Curtain" and "Running Fence," at the Capenter Center, Friday through Saturday at 7:30 and 9:30.

Around Cambridge

Jules and Jim. At the Brattle, nightly at 5:50 and 9:30, with Summertime, at 7:40.

Bed And Board. At the Central Square, nightly at 6 and 9:45, with Clair's Knee, at 7:50.

Black and White in Color. At the Galeria, daily at 1, 2:45, 4:30, 6:15, 8, 9:45.

New York, New York. At the Harvard Square, Saturday and Sunday at 3:05, 7:35, with Lenny, at 1:10, 5:30 and 10.

Great Ecstasy of the Sculptor Steiner. At Off the Wall, with Viva Le Tour, Solo and Walking. Complete show nightly at 6, 8 and 10.

Cria. At the Orson Welles, daily at 4, 6, 8:05, and 10:10.

Outrageous. At the Orson Welles, daily at 4, 5:50, 7:45, 9:45.

Buster Keaton Festival. At the Orson Welles: The Navigator, Friday through Sunday at 5, 7:30 and 9:45, with The Saphead, at 6:15, 8:40 and 10:50.

In Boston

Valentino. At the Cheri II, daily at 1, 3:15, 5:30, 7:45 and 10.

Philadelphia Story. At the Coolidge Corner Theatre, Friday and Saturday at 7:35. With Woman of the Year, at 5:30 and 9:35.