Rainbow Dash discovers Spike has the makings of a great archer to represent Ponyville in the next Equestria Games, but dragon-hating officials, and a dragon-fearing town are bent to bar him, and Ponyville, from the games
Spike is separated from his friends when he falls into the earth. Below, he finds a world teeming with life, both beautiful and lethal. Now, he must survive massive monster insects while obeying his dragon code. His refusal to kill may kill him.
A scientist wants to take Spike and study him in hopes of understanding dragons. Her methods make Spike refuse. A trial is commenced; Twilight as Spike’s defense attorney must prove Spike qualifies as a pony and cannot be used for experiments.
One incident. That’s all it took to make Twilight worry Spike is outgrowing her and pledge to devote all her time to her friend regardless of any other duties.