Journey To The Center Of Time (1968)

aka: Time Warp

Gruff, hard-nosed new boss Stanton (Scott Brady) takes over a scientific research company upon the death of his benevolent father. Scientists Manning (Anthony Eisley), Gordon (Abraham Sofaer) and White (Gigi Perreau), who are very close to a breakthrough in time travel, are told by Stanton they must have results in 24 hours or face a cut-off in funding. Trying to push their equipment past its safe operating limit they travel into the far future and distant past, with Stanton along as an accidental participant, unaware that a surprise awaits them as they struggle to return to the present. Also with Lyle Waggoner.