User blog comment:JuniperAlien/Who else would you like to see join the team?/@comment-66.44.25.244-20111210221153/@comment-1038387-20111210223721

Captain Marvel. Jr.

The cripple Freddy Freeman received powers from Captain Marvel (whilst Billy got them from the wizard Shazam). So while Billy shouted "Shazam" to change, Freddy had to shout "Captain Marvel". Because this meant he couldn't actually say his superhero name without losing his powers, he started using "CM3" instead during his time with the Titans.