Dr. Hasslein (Planet of the Apes)

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In the Planet of the Apes movie series, Dr. Otto Hasslein is a physicist attached to the space flight project that sends astronauts Taylor, Dodge, Landon, and Brent to the world of the apes. He was portrayed in the third Apes film, Escape from the Planet of the Apes, by actor Eric Braeden.

Spoiler warning: Plot and/or ending details follow.

Even before appearing onscreen, Hasslein's name is part of the series storyline, as the scientist who proposed the "Hasslein curve" – a form of time dilation possible with the craft used in the movies. When he does appear in Escape, he explains his theories of time, and his belief that changing the future may be possible.

Learning that talking chimpanzees Cornelius and Zira have actually arrived in the present day (1973 in the movie) from Earth's own future, where mankind has fallen to the level of beasts while apes rose to power and intellect, Hasslein sees confirmation of his theories – and becomes afraid that the pair's presence may somehow set man's downfall in motion. As the President's science advisor, he expresses his concerns, resulting in Cornelius and Zira first being taken into custody, then interrogated at length.

Provoked by Zira's drugged admissions of her experimentation on humans, and Cornelius giving details of his historical research into man's decline, the Presidential Commission appointed to deal with "Alien Visitors" concludes (in a reflection of Taylor's fate before the Ape council in the first movie, with Hasslein in the place of Dr. Zaius) that the couple's unborn baby should be "prevented" from birth, and that Zira and Cornelius should be "humanely rendered incapable" of conceiving again, with their ultimate fate to be decided later – at Hasslein's determination, though it appears likely they will be handed over either to scientists or the military for study.

When Cornelius and Zira escape military custody (at the beginnings of Zira's labor pains), Hasslein mounts a full-scale hunt, including searches of all local circuses and zoos. Days later, a carpet bag abandoned by Zira turns up, near the derelict shipyard where they have been hiding, and the pair are spotted soon afterward, with Zira carrying a baby chimp, so Hasslein knows she has given birth.

Boarding their ship, Hasslein approaches Zira, pistol in hand, and demands she give him the baby, as the authorities approach. Before they arrive, he gets the baby away from her, firing several shots into the swaddling blankets, then turns the gun on Zira.

Cornelius had asked Dr. Lewis Dixon, who had told the couple about the shipyard as a hiding place, for the means "to kill ourselves" to avoid being captured, and was given a pistol. Heretofore a pacifist, Cornelius now uses the pistol to defend his wife, shooting at Hasslein from a crow's nest on the ship. As the authorities arrive, Hasslein and Cornelius trade gunfire. Cornelius kills Hasslein, but is himself killed by sharpshooters, falling to the deck.

Despite Hasslein's best intentions, the baby he killed wasn't the offspring of Zira and Cornelius – and his treatment of their arrival may have just set in motion everything Hasslein hoped to prevent. Caesar grows up in Armando's circus, where he'd been switched with another baby chimp by his parents before their death. By the time he is grown (at the beginning of Conquest of the Planet of the Apes), Hasslein, Cornelius and Zira are all but forgotten – but primitive apes have become slaves, ripe for revolt under the right leadership.

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