Douglas Davenport

Douglas Davenport is the younger brother of Donald Davenport, Leo's step-uncle, and tritagonist/anti-hero of Disney XD's Lab Rats. In the midseason 2 finale, Douglas is revealed as the Lab Rats', Adam, Bree and Chase, biological father. Season 4 reveals he had another bionic son, Daniel, whom he gave up for adoption. He is the hidden main antagonist of Season 1, the main antagonist of Season 2 and the first half of Season 3, alongside Victor Krane. Additionally, Douglas is the brother-in-law of Tasha Davenport and the uncle of Naomi Davenport. He sends his android son, Marcus to spy on his family and capture Adam, Bree and Chase and tries everything to get Leo and Donald out of his way.

Halfway through Season 3, Douglas begins to reform when Krane makes it clear he wants to destroy his children. First, he warns Leo of Krane's plans and later saves his children when Krane attacks him. Douglas finally reformed when he fixes Bree's bionic chip, leading him to being accepted by and joining the Davenport Family by moving into the Davenport Household). Douglas also gave Leo a bionic arm after his original was crushed by Taylor when she was under the Triton App's influence and trained him how to use it properly and joined the Lab Rats in fighting Victor Krane during the Bionic War and began helping Donald Davenport manage the new Bionic Academy used to train the other students.