The Secret Surprise Ponies appeared in the My Little Pony line in Year 9. The ponies were slightly larger in size than other ponies in the line because they had a secret compartment inside to hold jewelry and small trinkets.
Each pony came with a special key and wore a molded plastic cape on its back. Placing the key into a medallion on the pony's neck would unlock the secret compartment and the cape would pop open. Each pony originally came with a piece of child-size jewelry and a brush.
The ponies in the Secret Surprise line were Pretty Puff, Secret Beauty, Secret Star and Star Dazzle. All the ponies in this line were Earth Ponies.