Spike had always been known as the baby dragon. Either by Twilight, or by others.
Despite saving the Crystal Empire not once, but twice, he still feels that he isn’t taken seriously when it comes to other ponies, and this frustrates him.
But after a disastrous event that leaves the fate of the most important ponies of Equestria unknown, it is up to Spike to save the day, and prove that he not just a baby dragon.
Or so, that was what he wished.