Payback

S1, E21: Van Kleiss has plotted his ultimate revenge: to take down Providence for good. After commandeering the Keep and laying siege to Headquarters, Providence is brought to its knees. And in an even more shocking twist, Van Kliess has managed to regain even stronger powers by taking Rex's from him! With Noah and Bobo at his side, Rex escapes the siege and retreats to a distant Providence base where a last ditch effort to regain his powers is attempted. It works, but with surprising results. Rex can now create even MORE machines...