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episode title: Happily Ever After

Air date: 2010-06-05

episode lenght: 43 minutes

Charles Widmore brings Desmond back to the island so that he can conduct a dangerous electromagnetic experiment, which sends him back to the alternate reality in Los Angeles, a reality where he has never met Penny. (source imdb)

IMDB rating: 8.8

This exact episode (6/11): imdb number tt1467630

Naveen Andrews => imdb link: nm0004710
Nestor Carbonell => imdb link: nm0004801
Henry Ian Cusick => imdb link: nm0193738
Emilie de Ravin => imdb link: nm0211087
Michael Emerson => imdb link: nm0256237
Jeff Fahey => imdb link: nm0001194
Matthew Fox => imdb link: nm0289142
Jorge Garcia => imdb link: nm0306201
Josh Holloway => imdb link: nm0391326
Daniel Dae Kim => imdb link: nm0196654
Yunjin Kim => imdb link: nm0453746
Ken Leung => imdb link: nm0504962
Evangeline Lilly => imdb link: nm1431940
Terry OQuinn => imdb link: nm0642368
Zuleikha Robinson => imdb link: nm0733196
Alan Dale => imdb link: nm0197638
Jeremy Davies => imdb link: nm0001111
Fionnula Flanagan => imdb link: nm0001217
Sheila Kelley => imdb link: nm0445992
Dominic Monaghan => imdb link: nm0597480
Fisher Stevens => imdb link: nm0001770
Sonya Walger => imdb link: nm0907427
Jonathan Arthur => imdb link: nm2209096
Hannah Bell => imdb link: nm2782923
Steve Boatright => imdb link: nm1758685
Kayren Butler => imdb link: nm0125005
Ben Cain => imdb link: nm0128861
Gerard Elmore => imdb link: nm1435286
Frederick Koehler => imdb link: nm0462735
Christopher McGahan => imdb link: nm3859803
Sundra Oakley => imdb link: nm0643041
Grisel Reyes => imdb link: nm2208499
Haley Cook => imdb link: nm3151825
James Koons => imdb link: nm3975118

Most of the info found on this page was found on imdb