It aired somewhere between the early 90s and mid 2000s.
I can't remember what channel it aired but it had to be Kids WB, Fox Kids/ Fox Box, ABC Family, Jetix or Cartoon Network.
Oar guy was part of a team of villain, two women(one of them might've been the kidnapped girl who got brainwashed, not sure), a scientist or wizard who created monsters, the guy who helped him kidnap the girl(he was the first villain to die, but not until the middle of the show), second in command and the leader.
There was another character with them too, but I can't remember their role. They either were a third party, defected to the heroes or wound up as final boss somehow.
Oar guy and second in command disliked each other. The leader of the group might not have been the final boss.
I barely remember the protagonists. There were three guys and three girls at the start, until one of the girls got kidnapped by the villains. Another member joined the team at some point, can't remember if they were a boy or girl.