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Guardian Prime appeared briefly and unnamed in "The Five Faces of Darkness" in The Transformers, in which he was one of the many Autobot leaders encountered by Rodimus Prime in the Matrix of Leadership. Guardian Prime lived before Cybertronians had discovered the ability to transform during the tyranny of the Quintessons.
In an "Ask Vector Prime" account, a Transformer named Guardian Major was Vector Prime's subordinate until the legendary member of the Thirteen Primes was called away to deal with a greater threat. He entrusted the Matrix of Leadership he had carried to Guardian Major, thus foreshadowing Guardian's promotion to the rank of Prime.