Raven is very suspicious of Terra, just as seen what was seen in "The new Teen Titans (vol.1) #28 and "Tales of the Teen Titans" #41 in the original comics. Her empathic powers sensed something troubling about Terra - as seen in this episode.
Terra adopts a new costume when she joins the team, just as she did in The new Teen Titans (vol. 1) #30. However, just like her first animated costume, her second costume in this animated series is very different from the comics. Terra now wears a black shirt with a "T" symbol on it with cargo shorts.
This is Terra's second appearance in the series. Since her last appearance, Terra has greater control of her powers.