In what version of the Street Fighter series did Sagat first become playable?

Question

I remember the first Street Fighter, Sagat was a boss where he got his chest scar from Ryu's finishing Shoryuken.

But in which of the Street Fighter series did Sagat first become playable?

Answer 1

Sagat became the penultimate boss in Street Fighter 2: The World Warriors. Along with the another 3 bosses, he became playable in Street Fighter 2: Champion Edition.