The following three actors have at least one or more connections to other shows featuring DC heroes. I chose the three that were the most distinctive and well-recognized.
14. George Newbern (Kal-El/Clark Kent/Superman (JL, JLU), Bizarro (JLU)) - George entered as a newcomer amidst controversy. Overtime, he got respect as a actor and proved that each voice of Superman is unique. He returned to play Superman in The Batman
Superman: I once thought I could protect the world by myself. But I was wrong. Working together, we saved the planet. And I believe that if we stay together, as a team, we would be a force that could truly work for the ideals of peace and justice.
13. Diedrich Bader (Zeta) - This comedian opened as a hero in Batman Beyond, replacing Gary Cole as the voice of him. His character, Zeta, eventually got his own series. He has the honor of being in four DC cartoons, one in which he plays The Dark Knight: Batman: The Brave and the Bold.
Ro: You know, maybe I can help.
12. Adam West (Simon Trent/Gray Ghost) - Not many people don't know him, so for those who have no clue, here are two words: 60's Batman. After playing the Gray Ghost in Batman: TAS, he starred as the mayor of Gotham City for the first four seasons of The Batman.
Gray Ghost: But I'm not the Mad Bomber! I'm not! I sold my Gray Ghost cars months ago to pay for my...(realizes who the Mad Bomber is) No. It can't be him!