Spike is a baby dragon who lives with the ponies.

He was Tirek's slave and Scorpan's friend. After Tirek was defeated, he came to live with the ponies in Dream Valley.

In the UK comics, he was the pet dragon of Majesty.

He is the only character to appear in every special and episodes in the cartoon series.

He's also the only main character other than Applejack (and later Tirek) to be reimagined in My Little Pony: Friendship is Magic.