Oroku Saki (Golden Harvest/Imagi)

First Movie, Teenage Mutant Ninja Turtles
Similar to the comics, Oroku Saki and Hamato Yoshi would both be members of the Foot and be in the love with the same woman, Tang Shen. Yoshi and Tang escaped to live in New York, but Saki found them. He killed Shen and waited for Yoshi to get home. During the fight, Splinter, still just a pet rat, escaped from his cage and bit and clawed all over Saki's face. The same sword slice that would kill Yoshi would also cut off a piece of Splinter's ear.

Years later in New York, the Shredder, alongside his second-in-command Tatsu, had formed the Foot, a gang of street kids and gangsters trained in the art of Ninjutsu and started what was called 'the Silent Crime wave' where no one so much as saw what was being stolen. When reporter April O'Neil started talking about the Foot on the news, the Shredder sent the Foot to force her into silence. She was rescued by Raphael, but one of the Foot followed them back to their lair. Later, while the Turtles were hanging with April in her apartment, the Foot attacked and kidnapped Splinter. Then they found and attacked Raphael to near death and sent him crashing through the roof of April's Second Time Around store. After a big fight with the Foot, the Turtles, April and Casey escaped to April's farmhouse.

Sometime later, the Shredder found April's artwork of the Turtles from one of his fellow members, Danny Pennington, signaling that the Turtles were back. The Shredder sent the Foot to the turtles lair and sent Tatsu to kill Splinter. The Turtles managed to defeat the Foot, and Casey Jones defeated Tatsu and rescued Splinter. Shredder finally appeared and had a dramatic battle against the Turtles. Upon hinting that the Shredder had already killed Splinter, Leo lost control and went at the Shredder head on. The evil ninja tripped him up and aimed his spear at him, telling the turtles to toss their weapons or he'd kill him. Even after the Turtles threw their weapons, the Shredder intended to kill Leonardo anyway, but Splinter finally arrived, revealing himself to be the same rat that clawed Saki's face so many years ago. The Shredder removed his mask and charged at Splinter in a blind rage, intending to spear him. Splinter, however, whipped out a nunchaku, wrapped it around the Shredder's yari and sent him over the side of the roof. Still hanging on to the yari, the Shredder threw a tanto at Splinter. Splinter caught the knife, but he had to let go of the nunchaku that was holding his spear, and the Shredder fell into a garbage truck. Casey Jones pulled a lever, and the garbage truck's hydraulic press apparently grind the Shredder to death.

The Shredder was voiced by David McCharen and portrayed by James Saito.

Second Movie, Secret of The Ooze
In Teenage Mutant Ninja Turtles II: The Secret of the Ooze, the Shredder somehow survived and returned to the Foot's fall back HQ, now bent on revenge against the Turtles. He sent a member of the Foot to spy on April, hoping to find the Turtles through her. When April's team was doing a report on T.G.R.I., the Foot agent found some mutated dandelions and sent one to the Shredder.

Upon seeing this, the Shredder sent Tatsu and the Foot to retrieve the last vial of Ooze at TGRI and kidnap Professor Jordan Perry, and had a wolf and a snapping turtle turned into mutants. However, the mutation did not go precisely as planned, and the new mutants Tokka and Rahzar had the minds of babies. The Shredder ordered Tatsu to kill them, but Perry convinced him to keep them alive since their brute strength would be useful. The Foot captured Raphael and used him as bait to lure the other turtles; Shredder had them caught in a net and was about to impale them on a bed of spikes. Splinter arrived to set them free, and the Turtles fought the Foot, Tokka and Rahzar and escaped with the professor.

The Shredder would release Tokka and Rahzar to do damage upon the city as a means to challenge the Turtles to a final showdown. In the final battle, which was carried right into a Vanilla Ice concert, the Turtles would defeat the Foot and Tatsu and demutate Tokka and Rahzar. The Shredder arrived with the last canister of Ooze, but the Turtles' ally Keno arrived to spin-kick the vial out of the Shredder's hands, which would be taken away by Professor Perry. Following this, the Shredder grabbed a random girl from the concert and threatened to pour Ooze on her from a tiny vial he still possessed. Keno and Don, however, used the loudspeakers to blast him out of the building and into the docks outside. The turtles followed him, only to find that the Shredder used the Ooze on himself out of desperation and had now transformed into a monster. Blinded by rage, the Super Shredder started breaking down the support beams of the docks, hoping to bring it all down on himself and the Turtles. The turtles escaped by diving into the water, while Shredder finally met his end.

It is worth noting that the Shredder's cape and armor also grew when he mutated; this is an uncommon feature to other victims of the ooze. Another thing worth noting is that in the first Turtle movie (as well as the beginning of the second when he first escaped the pile of garbage) the Shredder wore red like he did in the Mirage comics. In the second movie he wore purple like in the 80's cartoons. In both movies he also had a black cape. When he rebuilt his helmet in the second movie, he added buzz saw-like ridges along the sides. In the first movie he used his infamous claw on just the left hand instead of both.

David McCharen reprised his role as the voice of the Shredder (as well as Super Shredder). François Chau physically portrayed the Shredder, and Kevin Nash played Super Shredder.

Fourth Movie, TMNT
While the Shredder makes a brief cameo appearance in TMNT, the movie opens with how the Turtles finally defeated him, and explained how they went along their separate ways. Karai now leads the Foot and uses them more as mercenaries rather than a street gang. In the end of the movie Karai hinted that the Shredder might be back. In the end of the movie, Splinter walks towards a display case of past adventures which would include things such as the canister of ooze from the second movie, the Time Scepter from TMNT III and the Shredder helmet, looking like it did in the first Turtle movie. It's also worth mentioning that Playmates released a kind of 'what if the Shredder was in the movie' action figure version of the Shredder.

Trivia

 * Much like his defeat in the Eastman And Laird's Teenage Mutant Ninja Turtles#1 He is defeated the same way in the first film minus the explosive and with the intervention of Splinter, as he did not intervene in the comic.