Brain Drain is the 15th episode in the 1st season of T.U.F.F. Puppy.
Plot: After a hard day of work, Dudley accidentally slips into Keswick's new invention: The Brain Drainer 2000!!! Everybody's hating the STUPID version of Dudley, with only one exception: Snaptrap. The scheming rat has a plan to make Dudley turn AGAINST T.U.F.F., and it works! Will the team save Dudley and restore his brain, or will Dudley work for D.O.O.M. with no idea what he's doing?