<P> The Simpsons go to a STEM conference, where Lisa becomes smitten with an older musician called Brendan . Upon seeing them together, Nelson gets jealous because of his past relationship with Lisa and tries to win her over instead . Meanwhile, Bart discovers his affinity for chemistry . </P> <Tr> <Th> 629 </Th> <Td> 11 </Td> <Td> "Frink Gets Testy" </Td> <Td> Chris Clements </Td> <Td> Dan Vebber </Td> <Td> January 14, 2018 (2018 - 01 - 14) </Td> <Td> XABF04 </Td> <Td> 8.04 </Td> </Tr> <Tr> <Td_colspan="8"> <P> Mr. Burns builds a doomsday ark, after he believes that the end of the world is near when he sees an old Orson Welles show about Nostradamus . Professor Frink comes up with a new way of testing everyone in Springfield after Burns wants a test to determine who should go on a spaceship with him . </P> Guest stars: Valerie Harper as Proctor Clarkeson and Maurice LaMarche as Orson Welles </Td> </Tr> <P> Mr. Burns builds a doomsday ark, after he believes that the end of the world is near when he sees an old Orson Welles show about Nostradamus . Professor Frink comes up with a new way of testing everyone in Springfield after Burns wants a test to determine who should go on a spaceship with him . </P>

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