"The 3rd Apprentice Part 2"

Plot Summary
Right after Beast Boy goes missing for a couple of hours, the other Titans go off in search of their missing good friend and teammate, but they now realize is that he's in 1 of Slade's apprentice outfits, and they must find some ways to snap him out of it and return him to their team.

Transcript
"The 3rd Apprentice Part 2" transcript