Does the character Sentinel Prime appear in any Transformers films?
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Sentinel Prime is the name of several fictional characters in the various "Transformers" series in the Transformers robot superhero franchise. First mention of Sentinel Prime was in issue #65 of the US Marvel Comics "Transformers" series, where he was mentioned to hold the Autobot Matrix of Leadership before Optimus Prime. Sentinel Prime is One of the members of the Dynasty of Primes and dedicated as the leader of the Autobots and has since appeared in a variety of forms as either Optimus Prime's mentor or friend. Fun Publications has also had a character in their comic called Sentinel Major, who is based on the "Transformers Animated" version of Sentinel Prime. He is also the main antagonist in the film "," where he betrays the Autobots and later Megatron for his own personal interests. His original "Generation 1" incarnation was later reimagined by IDW Publishing as a similar fallen figure, perhaps in lieu of his movie counterpart.
Sentinel Prime
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Sentinel Prime appears among the characters in "Re-Unification", the 2010 TFCon voice actor play prelude comic.
In the "Transformers" film series, Sentinel Prime is a legendary warrior thought to have been lost long ago and is Optimus Prime's direct predecessor and mentor. Unlike his animated counterparts, he plays more as a villain in the real-live version. It was he who taught Optimus the ideals of freedom to all sentient beings. Sentinel is armed with a shield, a double-bladed Primax Blade that can be folded into one and a cosmic rust cannon that causes any metal object that it hits to rust into oblivion. The effect of this is shown when he shoots Ironhide twice in the back and once in the chest, killing him.
Sentinel Prime
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Animator Scott Benza said Sentinel Prime had a face "more human-like than any of the other robots" in "Transformers: Dark of the Moon", having a more complex frame and "a greater number of plates" so it could be more expressive. The film's main visual effects company, Industrial Light & Magic, based most of Sentinel Prime's features on actor Sean Connery, and after Leonard Nimoy was cast to voice the role, the effects were altered to incorporate Nimoy's acting as well.
Sentinel Prime
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This version of Ultra Magnus is a recolor of "Armada" Overload. It was released in 2004 and came with a recolor of the "Armada" Space Mini-Con team. The "Transformers: Universe" white and blue repaint of "Armada" Optimus Prime designated Ultra Magnus was also incorporated into this version of the character.
In 2007, "USA Today" polled people as to which Transformer they want to appear in the next Transformers film. Ultra Magnus came in tied for fourth with Shockwave. Ultra Magnus was considered to appear in "", before the role was given to Sentinel Prime. The design that was intended to be used for the character is seen briefly during the film's prologue, repurposed as the design of a generic deceased Autobot. To date it is unknown if Ultra Magnus will appear in any future movies.
Ultra Magnus
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In December 2007, drawings were leaked on the internet of Sentinel Prime's vehicle appearance in the "Transformers Animated" television series. He turns into a snow plow truck. Derrick Wyatt stated that the character was originally meant to be named Rodimus Prime, after Optimus Prime's G1 Successor. However, the idea of Rodimus being portrayed as arrogant and rude was dropped in favor of Sentinel Prime. An interesting note is that Sentinel's robot mode bears a strong resemblance to The Tick, which was a result of Townsend Coleman (the voice of the animated Tick) being cast in the role.
Sentinel Prime
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Sentinel Prime is among the characters who appear in the flash game "TRANSFORMERS CYBERVERSE Battle Builder Game".
Sentinel Prime
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The "" comic features Sentinel Maximus, a character who is the fused form of the Transformers characters Primal Prime and Apelinq, who were merged to be able to defeat Cryotek during an untold story. Universe characters Nemesis Prime, Ramjet and his Mini-Cons also appear in this story.
Transformers Universe (comic book)
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Skids and Mudflap were originally set to appear in , but were cut from the final film due to many fans considering them to be racist and due to time restraints. Despite this, he and Mudflap do appear in vehicle form at the end of two Autobot convoys at the beginning of the film. They have been upgraded into black Chevrolet Sparks with a stripe of their original color, thus making Skids black and green. As they do not appear in any subsequent Transformers film, it is generally accepted that Skids and Mudflap either met their end from Sentinel Prime or were killed by Cemetery Wind in between Transformers: Dark of the Moon and Transformers: Age of Extinction. 
There has been a strong negative reaction to Mudflap and Skids in "" as the pair were received by some as racist stereotypes. The characters speak in street-slang dialogue, confess to not doing much reading, and have been perceived by some critics to have been designed with the body proportions of monkeys. Skids also sports a gold tooth. Manohla Dargis of the "New York Times" said that "the characters [...] indicate that minstrelsy remains as much in fashion in Hollywood as when, well, Jar Jar Binks was set loose by George Lucas." Critic Scott Mendelson of "The Huffington Post", who perceived the characters to resemble monkeys, said, "To say that these two are the most astonishingly racist caricatures that I've ever seen in a mainstream motion picture would be an understatement." Harry Knowles, founder of Ain't It Cool News, asked his readers not to support the film, telling them, "you'll be taking [your children] to see a film with the lowest forms of humor, stereotypes and racism around." Director Michael Bay has defended the characters, explaining that the characters' mannerisms were chosen by the actors who voiced them, and that they did so in fun.
Skids (Transformers)
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His intention is to restore Cybertron to its former glory. But as the war dragged on, he was driven mad by desperation, with Quintessa corrupting and ordering him to bring Cybertron to Earth (Unicron) on her behalf hoping to destroy it, causing Sentinel to turn against his ideals and ally with Megatron and the Decepticons and eventually become as corrupt and vile as they were. Sentinel Prime is voiced by Leonard Nimoy, who previously voiced the character Galvatron in "" back in Generation One. Note: This was Leonard Nimoy's last major film role in the Transformers robot superhero franchise until his death in 2015.
Sentinel Prime
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In the video game adaptation, "", Sentinel is named Zeta Prime, and dies shortly after the Autobots rescue him from Soundwave. Zeta was also a name previously used for a separate character who briefly appeared in the "Generation 1" 1980's cartoon and more prominently featured in the 21st century IDW Publishing comic book series, where he was depicted as Sentinel Prime's predecessor in the former and successor in the latter. Since the "Exodus" novel featured a Sentinel Prime and the "War for Cybertron" video game featured a Zeta Prime, both occupying the same role, Hasbro suggested at BotCon 2010 that they were the same guy: "Sentinel Zeta Prime". However, the "War for Cybertron" comic also written by Alex Irvine refers to the disappearance of Sentinel as depicted in the novel, when Zeta Prime in the games doesn't go missing until much later than the novel portrays it. Yet, the comic portrays Sentinel Prime with Zeta Prime's appearance, in attempt to further enhance the connection between the two.
Sentinel Prime