Douglas Davenport

Douglas Davenport was once the stone cold main antagonist of Lab Rats but after Sink or Swim, he developed a change of heart as he saved Chase Davenport, Adam Davenport and Bree Davenport from Victor Krane and afterwards helped Bree get bionic again. Since then, Douglas has joined the rest of the Davenport family. Even His brother, Donald Davenport has come on good terms with him.

Personality
Douglas was formerly, though still fun-loving, very cold-hearted and envious, and commited evil things such as attempting murder on his own brother just for being jealous at him, creating bionics to assist him, and killing anyone who gets in his way. After Sink or Swim though, Douglas has now become a more tolerant, noble and sacrificial person. He's not even as envious of Donald as he used to be.

Background
Douglas was always envious of Donald. He told Chase that his brother comes and steals the spotlight. His Enviousity got worse as he grew up, Douglas became emotionless and cold. Despite being evil in the past, Douglas was always a good person at heart and would never go as far as killing the Lab Rats since he was the real creator of them.