We've already been over DC's somewhat spurious lawsuit against Wonder Man as a copy of Superman, but not its legal action against Wonder Man as a copy of Wonder Woman. This Wonder Man was an early Avengers villain, featured in 1964. DC Comics made its displeasure felt at the use of "Wonder" in the character's name, feeling it would take something away from the brand identity of Wonder Woman. (Because if there's one thing people are always forgetting about Wonder Woman, it's the fact that she's a woman. When comics were sold in the supermarket, people used to buy her stories instead of Wonderbread all the time.) Stan Lee backed down from this particular fight with DC, declining to bring the character back from his apparent death, and he languished in obscurity for years before other writers brought him back as an on-again, off-again Avenger. Lee was somewhat put out when DC Comics introduced Power Girl in the mid-1970s... a couple of years after Marvel had introduced its title character, Power Man.
T Campbell has written quite a few online comics series and selected work for Marvel, Archie and Tokyopop. His longest-running works are Fans, Penny and Aggie-- and his current project with co-writer Phil Kahn, Guilded Age.