Teen Titans, Vol. 3 #13 (2004)

Beast Boys and Girls, Part One: Concrete Jungle
A flashback reveals how Garfield Logan came to have his ability to transform into green animals. Wonder Girl, Kid Flash, Raven and Starfire take a day trip into San Francisco in their civilian identities. Raven tries to help Wonder Girl sort through some feelings. Bart tries to get a tattoo. And they're attacked by a green elephant, who is not Gar! Children seem to be getting ill, and then mutating into green animals. And Gar? He's no longer green, and no longer has his powers. Meanwhile, Superboy visits Gotham searching for his friend Robin, and discovers a girl is now wearing the costume! He gets little help from Batman finding his friend, Tim Drake.
Release Date: 2004