She-Ra: Princess of Power (1985)

S1E61 Darksmoke and Fire

Modulok constructs a rocket designed to sever the dimensional link between Etheria and Eternia, the very gateway She-Ra and He-Man rely on. The blast hurls Adora a thousand years back into Eternia's ancient history. Stranded in a forgotten era, she encounters Granamyr, the venerable dragon, and his steadfast companion, Tarben, who become her unlikely guides in this unfamiliar world.