Assertion: batman's sidekick | /r/HasProperty | come into being
Facets:
value: in the 1980s
type: TEMPORAL
value: in 2000s
type: TEMPORAL
value: in 1990s
type: TEMPORAL
Source sentences:
text: Most of the Golden Age and Silver Age sidekicks have subsequently evolved into mature heroes in their own right or have been killed off; and in the 1980s, 1990s, and 2000s, some new sidekicks have come into being.