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Star Trek: The Next Generation: S4 E18
Identity Crisis
Stardate: 44664.5. Geordi and a former crew mate begin evolving into bizarre creatures when they return to a planet both of them were on during an Away Mission five years earlier.
S4 - E1The Best of Both Worlds (2) Sep. 24, 1990
S4 - E2Family Oct. 01, 1990
S4 - E3Brothers Oct. 08, 1990
S4 - E4Suddenly Human Oct. 15, 1990
S4 - E5Remember Me Oct. 22, 1990
S4 - E6Legacy Oct. 29, 1990
S4 - E7Reunion Nov. 05, 1990
S4 - E8Future Imperfect Nov. 12, 1990
S4 - E9Final Mission Nov. 19, 1990
S4 - E10The Loss Dec. 01, 1990
S4 - E11Data's Day Jan. 07, 1991
S4 - E12The Wounded Jan. 28, 1991
S4 - E13Devil's Due Feb. 04, 1991
S4 - E14Clues Feb. 11, 1991
S4 - E15First Contact Feb. 18, 1991
S4 - E16Galaxy's Child Mar. 11, 1991
S4 - E17Night Terrors Mar. 18, 1991
S4 - E18Identity Crisis Mar. 25, 1991
S4 - E19The Nth Degree Apr. 01, 1991
S4 - E20Qpid Apr. 22, 1991
S4 - E21The Drumhead Apr. 29, 1991
S4 - E22Half a Life May. 06, 1991
S4 - E23The Host May. 13, 1991
S4 - E24The Mind's Eye May. 27, 1991
S4 - E25In Theory Jun. 03, 1991
S4 - E26Redemption (1) Jun. 17, 1991