1968 Press Photo Charlton Heston & Linda Harrison in "Planet of the Apes."

On Saturday, December 26, Cinemax goes bananas with "Planet of the Apes" Day, presenting all five memorable sci-fi flicks back-to-back, beginning at 11:30 a.m. (ET) with Planet of the Apes, starring Charlton Heston and Linda Harrison in the 1968 classic that started it all. Then, it's Beneath the Planet of the Apes at (1:30 p.m.), followed by Escape from the Planet of the Apes (3:00 p.m.), Conquest of the Planet of the Apes (4:45 p.m.) and Battle for the Planet of the Apes (6:15 p.m.).

Photo is dated 1968.

Photo measures 10 x 8.25 inches.