Stridor is a robotic horse that serves as a steed for the Heroic Warriors.
In the minicomic The Clash of Arms, Stridor carries Fisto to scout the borders. When Fisto is captured by the Evil Warriors and forced to fight in the Circle of Doom for his life, Stridor brings He-Man to the Circle of Doom, saving Fisto from Whiplash.
Stridor also appears in the episode "Origin of the Sorceress" in the original animated series. While initially built by Man-At-Arms as a robotic transporter, the steed ultimately becomes sentient by the end of the episode, and is therefore granted freedom off in the wilderness.