Lab Rats (2012)
S4E21 And Then There Were Four
Episode Overview
Everyone is taken aback when Douglas reveals he has a fourth bionic sibling, Daniel, who has been living a normal life with his adoptive family. Daniel visits the academy to connect with his father, uncle, and cousins. When the Lab Rats unintentionally activate Daniel's bionic abilities, Donald and Douglas must explain his power-replicating skills to him. He also learns that his cousins are actually his biological siblings. Upset, Daniel steps outside for some fresh air, where he talks to Leo about Douglas. Shortly after, Daniel accidentally triggers a leak in the hydro-loop’s fuel tank while using Leo's powers. Together, Adam and Daniel manage to contain the situation, and Douglas apologizes to Daniel, who ultimately decides to give him another chance.