Assertion: big bang theory's episode | /r/CapableOf | follow brian
Facets:
value: in order to prevent stewie's existence
type: PURPOSE
value: on their quest
type: OTHER
Source sentences:
text: This episode follows Stewie and Brian on their quest to stop Stewie's evil half-brother Bertram from going back in time to the Renaissance period and killing Leonardo da Vinci, who is a part of Stewie's ancestry, in order to prevent Stewie's existence.