The team faces Mr. Twister. Back in the Teen Titans first issue they faced the same villain but in a different incarnation
As far as the show's producers are concerned, the most significant aspect of this episode was that it serves as a showcase for Miss Martian. They wanted to show what she could do and what her power set was. They also wanted to giver her a sense of personality or how of if for that matter if, she'd be able to fit into this boys club they had established in the first two episodes.
Arc Number 16 shows up; Robin and Kid Flash arrive in the cave at 11:16.
This episode takes place on July 17.