Titans Annual (Titans Vol. 3 #1)

When Dick, Wally, Donna and Garth awaken in an unfamiliar place, they find themselves face-to-face with their mentors: Batman, The Flash, Wonder Woman and Aquaman! Allied together against a common foe, the mentors and protégés must race against the clock to unlock the secret of their current predicament and save the planet from an alien invasion!