That's not confirmed, for two reasons. One, the cover doesn't show the Teen Titans. And two, Donna wasn't a sidekick (she didn't exist before then, the writer mistook Wonder Girl for a sidekick when she was really more like Superboy) and only joined the team in their SECOND story (albeit the one in which they got the name Teen Titans). The original lineup was just Aqualad, Robin, and Kid Flash.
https://dc.fandom.com/wiki/The_Brave..._Bold_Vol_1_54
So only Garth and Wally are confirmed to be guesting in that issue. Donna and Roy (who was the team's fifth member) might appear, but we don't know that yet.