The Comet, the Unicorn and the Bad Gadgetinis

The unicorn comet approaches Earth for the first time in 777 years which was also the last time unicorns were seen. The comet is putting out a magnetic field which affects electronics and Penny is worried her uncle might go haywire but as the Gadgetins say, how would you tell? Meanwhile MAD's astronomer tells Dr. Claw that the comet's magnetic field also scrambles the natural invisibility field that unicorns can generate which is why they're so rarely seen and why the last sightings were during the comet's last visit. Since unicorn milk is reputed to grant superhuman strength Dr. Claw would like to find some to make his MAD agents superstrong. Back at Gadget's house the Gadgetinis programming has become corrupted and so have they as they refuse to do anymore work without substantial rewards. Dr Claw contacts them and promises them riches if they dispose of Gadget and catch him a unicorn and they agree. Can Penny figure out how to fix them before they give Dr. Claw what he wants?