The episode title is a reference to [http://en.wikipedia.org/wiki/Survival_of_the_fittest phrase] originating in evolutionary theory, as an alternative description of natural selection.
== Season 8 ==
'''[[8.01 We Need to Talk About Kevin]]'''
'''[[8.02 What's Up, Tiger Mommy?]]'''
'''[[8.03 Heartache]]'''
'''[[8.04 Bitten]]'''
'''[[8.05 Blood Brother]]'''
'''[[8.06 Southern Comfort]]'''
'''[[8.07 A Little Slice of Kevin]]'''
'''[[8.08 Hunteri Heroici]]'''
'''[[8.09 Citizen Fang]]'''
'''[[8.10 Torn and Frayed]]'''
'''[[8.11 LARP and the Real Girl]]'''
'''[[8.12 As Time Goes By]]'''
'''[[8.13 Everybody Hates Hitler]]'''
'''[[8.14 Trial and Error]]'''
'''[[8.15 Man's Best Friend with Benefits]]'''
'''[[8.16 Remember the Titans]]'''
'''[[8.17 Goodbye Stranger]]'''
'''[[8.18 Freaks and Geeks]]'''
'''[[8.19 Taxi Driver]]'''
'''[[8.20 Pac-Man Fever]]'''
'''[[8.21 The Great Escapist]]'''
'''[[8.22 Clip Show]]'''
'''[[8.23 Sacrifice]]'''