What popular sci-fi creations were described by Dr Who's executive producer in 2011 as ...the most reliably defeatable enemies in the universe... ?
what popular sci-fi creations were described by dr who's executive producer in 2011 as ...the most reliably defeatable enemies in the universe... 
FreebaseQA-train-6185.P0 FreebaseQA-train-6185.P1
dr who dr who
doctor who doctor who
m.02hk5y8 m.02hk6lg
user.techgnostic.default_domain.tv_series_seasons.serials tv.tv_series_season.episodes
m.02wmsx
the daleks
m.02hqmx8
the daleks