Schwarzenegger's Childhood is largely the same besides butterflying away his brother Meinhard's death in a car crash in 1971. ITTL Schwarzenegger's father died during the production of Pumping Iron and Schwarzenegger's coldness is recorded in the actual film as well as the man himself appearing in the film(Arnold has claimed he was so committed to bodybuilding that he didn't attend his father's funeral which was invented for the film based on another bodybuilder's story but Arnold has ran with it ever since). At 18 year olds he fought in Vietnam overseas, given him actual military experience before deciding to become a bodybuilder. Like OTL he met and was trained by his idol Ray Park before moving to LA.What happens to Arnold Schwarzenegger ITTL? Does he still become involved in politics?
Hercules in New York(1970) remains the same though Arnold is not dubbed over and keeps his true name in the credits. Pumping Iron(1977) still happens but Lou Ferrigno wins the competition and Arnold announces his retirement as he wanted to go into film anyway. Arnold then goes onto play the Incredible Hulk on TV in Lou Ferrigno's place( a popular but false rumor OTL. Arnold was asked but was busy with Conan and suggested Lou Ferrigno). ITTL the Incredible Hulk also features a crossover with the live action Spider-Man series and several others relating the 1970's Defenders made up of marvel 70's show characters(Spider-Man, Doctor Strange, Captain America, Hulk etc).
The series ends when he goes off to star in Oliver Stone's Conan The Barbarian(1982). However there is no sequels until a later one with an older Arnold showing how he became King. He still plays the Terminator in 1984 and its sequel. Red Sonja is a Bakshi film though Arnold voices Conan. He does not star in Commando as the role instead goes to Gene Simmons, its original choice. Predator(1987) remains the same. The Running Man instead stars Christopher Reeve and is directed by Andrew Davis(as a result it's a darker story more in line with the original rather than an action comedy about an innocent man suddenly being hunted at random. Red Heat(1988) still exists as does Twins(1988) with a sequel sometime later called Triplets adding Eddie Murphy as the triplet. Replacing Kindergarten Cop(1990). Total Recall was released earlier under David Cronenberg(he wrote the first 12 scripts for it OTL, hence the body horror elements of the film) and stars William Hurt. Terminator 2 in 1991. Last Action Hero(1993) with a somewhat different plot but same idea. Around 1994, Shwarzenegger becomes Doctor Octopus and Cameron's Spider-Man films. True Lies is delayed to the 2000s, and the following he doesn't do and therefore they are not made: Junior, Eraser, Jingle All the Way, End of Days. He also plays Dr.Manhattan in Watchmen sometime around this point in the early 80's mid 90's while Mr.Freeze is played by Patrick Stewart in a more serious film. There's also Paul Verhoeven's Crusade, and before that the titular role in Judge Dredd as TTL's Robocop, which is very different.
In the 2000s, True Lies 2 is released along with the final James Cameron directed Terminator 3. He still enters politics and does run for President, unsuccessfully. He still appears in The Expendables series. Playing Conan once again. He does not do Escape Plan which stars Bruce Willis instead. He then plays Hercules in the Marvel Movies based on the comic character, which is his last role before he retires and enters politics, becoming President of Germany.