from TheTVDB: While the Monarch schemes to dispose of Dr. Venture once and for all, Henchman 21 seeks revenge on Brock for the death of 24.

2009 episode

contained in

Season 4 (2009) - Questions are answered and truths are revealed. Learn how Henchman 21 copes with life without 24. See what happens when Brock and the Venture family are forced to part ways. Discover the final fate of H.E.L.P.eR. And all the while, the balance of the free world hangs in the hands of Dean Venture, who must kill Hitler.