In The Transformers episode "Five Faces of Darkness: Part 4", Rodimus Prime journeys into the Matrix of Leadership and witnesses a series of flashbacks of Cybertron's early days.

In the Cartoon Network television show Transformers: Animated, Sentinel Prime is a supporting character and an imposing figure within the Cybertron Elite Guard corps with a brash and smug demeanor as well as an obsession with following the rules of his superiors.

[1] Sentinel Prime is the main antagonist of the 2011 film Transformers: Dark of the Moon, established as Optimus's teacher and the leader of the Autobots.

Though Sentinel initially appears as a noble character, refusing the Matrix of Leadership from Optimus and asking him to take on his role as a mentor to the Autobots, he is revealed to have allied centuries prior with Megatron and the Decepticons to conquer Earth (Unicron) and even assassinates Ironhide.

Rumored to have been killed by Megatron during the early years of the Great War, Sentinel Prime later reveals that he had survived by imparting his knowledge into a smaller robot body and escaping in plain sight.

They both mastermind a plot to send the reanimated Titan giants to attack Cybertron but Sentinel is eventually shot down by Red Alert, who turns on him.

The truth was discovered by Orion Pax, D-16, Elita-1 and B-127, when Alpha Trion reveals that Sentinel was just the assistant, until he betrayed and killed the Primes to steal the Matrix from them, which failed when it rejected him and disappeared.

[7] Released in 2008, Sentinel Prime has a Deluxe Class action figure that converts into a dark blue pickup truck with an orange-silver snow-plow attachment and has two accessories included, which are a lance and shield.