sam penultimate episode season fox science fiction television series fringe episode overall storyline follows continuing prime universe fringe team races prevent destruction world fbi agent recruits help peter recovers touching machine previous episode executive producers wrote episode cinematographer directed meant middle epic trilogy season finale aired following week guest actors returned respectively initial broadcast april united_states estimated million viewers tuned viewers america time shifted episode watched live leading percent increase demographic highest increase network week episode received generally positive reviews television critics divided ending comparing television series lost plot prime universe machine creates numerous static lightning storms eastern walter peter recovery failed attempt enter machine olivia takes machine states machine meant device strange effects machine frustration believing peter inside machine suggests finding break shield protecting device peter time enter olivia travels collect box key containing explains descends long line men named found incomplete collection information people device sought try find rest collecting box key open find revealing olivia walter determine effects device occurring areas western massachusetts locations machines prime parallel respectively aligned like iron ends walter convinces device reduce area affected strange events time peter wakes confused memories leaves hospital traveling location new_york_city buying silver dollar coin shop olivia bring walter recognizes olivia powers turn machine parallel universe prepare olivia use quantum contact parallel universe olivia struggles unsuccessfully trying activate walter support peter soon discovered new_york time machine moved position walter olivia rejoin finding confused believing parallel universe peter eventually comes senses walter believing confusion temporary result head trauma calls trio lab revealing better man father phrase olivia peter talked giving hope olivia able parallel universe device peter takes moment recall events life including experiences walter olivia steps machine peter wakes chaotic street new_york_city finds unfamiliar territory facing plaque dedicated victims september attacks falls wounded arms officer fringe division production episode written executive producers directed cinematographer second episode season season finale scheduled hour long executive producer confirmed episodes linked continuous story arc reflection executive producer intent episodes season like turning page chapter novel usually good novel pages chapter forward new understanding subject matter deeper wait turn page media outlets referred episodes season finale actor called beginning scene olivia walter naked funniest thing explaining writers throwing challenges said okay john scene naked said okay big surprise scene strange scene clothes staying bishop house walter running clothes pair getting breakfast comes round corner catches going didn know look probably fun things reaction haven seen scene hilarious march exclusively confirmed previous guest actor returning twentieth episodes season appeared season twelfth episode concentrate ask role sam marked seventh appearance fringe actor expressed appreciation character title disappointed alluded final appearance date episode credit series previously stated interest returning ancestors fringe episodes fox released science lesson plan collaboration grade school children focusing science seen sam intention having students learn static electricity created dissipated reception ratings broadcast united_states april episode watched estimated million viewers scored ratings share adults viewers time shifted episode watched live ratings increased percent demographic resulting rating largest increase television series airing week reviews sam received generally positive reviews television critics ken_tucker entertainment_weekly called episode equally surprising plotting pacing praised sam olivia scenes believed ending mind blowing startling thrilling graded episode writing half wasn week episode lot set explanation required story moving second half brought emotion tension topped unexpected gut punch ending murray admitted eyes bit search believing little lost quirky helped columnist agreed murray lost comparison writing ending episode right lost little nose liking good bridge episode taking setup week week comes ign writer positive final sequence explaining minutes story changed excited series praising special effects noted displeasure ends mystical magical previous stories hinted wished screen time episode calling great character writers spent lot time building rated indication good episode criticized slow pacing pleased olivia appeared drawing expressed skepticism revelation manipulation render heroes actions sacrifices meaningless staff highlighted sam best television episodes united_states network television schedule
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