Gadget's Clean Sweep

S2 E18: Dr. Claw has located Gadget's l9th Century relatives, living in London. He sends Thelma back in time to dispose of them, thus doing away with Gadget at the same time. He instructs her to steal the Crown jewels, as long as she's there. Quimby catches wind of the plot and dispatches Gadget, along with Penny and Brain, in a time machine to follow Thelma. The time machine will only stay back in time for 4 hours. If our heroes aren't in it, they'll be stuck in the l9th Century.