: It is revealed that Douglas Davenport is actually the biological creator and father of Adam, Bree, and Chase. Donald is their uncle, who took them to protect them from Douglas’s plan to turn them into soldiers.
: Marcus is revealed to be an android created by Douglas, possessing all the Lab Rats' powers combined. He is seemingly destroyed at the end of the episode. [S2E14] Bionic Showdown: Part 1-2
: Douglas Davenport, Donald’s long-thought-dead younger brother, returns to kidnap Donald. He uses Donald as bait to lure Adam, Bree, and Chase into his lair. : It is revealed that Douglas Davenport is
: Unlocks a second hidden ability (Magnetism/Molecular Kinesis). He is seemingly destroyed at the end of the episode
" Bionic Showdown " (Season 2, Episode 14) is a pivotal one-hour special in the Lab Rats series that originally aired on August 5, 2013 . It serves as a major turning point, revealing the true origins of the bionic trio and introducing their primary antagonist, Douglas Davenport.