Last weeks episode was titled Ghosts, and its quickly made clear why.
In the wake of various attacks, the whole cast reunites at Titans Tower.
Donna thinks Dick should be honest with the new Titans about what happened with the old Titans.

Credit: Ken Woroner / 2019 Warner Bros.
We spend a lot of time this episode with Kory and her Tamaranian kidnapper, Faddei.
Apparently, he and Kory have a bit of a history together.
Lets hope that means Blackfire!
Eventually, Gar detects just such a surge.
Sure enough, they find Dr. Light, and it looks like Jason is about to do just that.
We immediately cut to Garth, who hears a scream and comes running.
This weeks episode is entirely a flashback to the original team five years ago.
Aqualad (Drew Van Acker).
But lets recount the exact sequence.
We see this team of Titans take down a bunch of muggers attempting to assault a family.
Later, at the Tower, its Garths birthday celebration.
But then Dawn comes up and convinces her to join in the fun.
But her connection with Garth is undeniable.
But before anything else happens, they get pulled into a confrontation with Dr. Light.
Aqualad faces him one-on-one, giving the others time to surround and flank the villain.
Jillian tells Donna she has to return to Themyscira that night.
He wakes up alone, of course, and has to hear from Dick where Donnas gone.
He doesnt give up easily though, and races to the air field where Donnas plane is waiting.
He confesses his love for her and tells her to stay.
Was he explicitly aiming for Garth, or Donna, or even Jillian?
Hopefully, well spend more time in the flashback period to find out.