On this day in the Star Trek universe:

Star Trek: The Next Generation (1989)

Star Trek: Voyager (1996 & 1998)

Star Trek: Enterprise (2005)

Star Trek: The Next Generation

Season 2. Episode 15.

Episode entitled: Pen Pals.

Released April 29, 1989.

Directed by Winrich Kolbe.

Written by Melinda M. Snodgrass, Hannah Louise Shearer.

Created by Gene Roddenberry.

Music by Dennis McCarthy.

Cast: Patrick Stewart, Jonathan Frakes, LeVar Burton, Michael Dorn, Marina Sirtis, Brent Spiner, Wil Wheaton, Diana Muldaur, Nicholas Cascone, Nikki Cox, Ann Gillespie, Colm Meaney, Whitney Rydbeck, Majel Barrett, James G. Becker, Jeffrey Deacon, Randy James, Tim McCormack.

Star Trek: Voyager

Season 2. Episode 23.

Episode entitled: The Thaw.

Released April 29, 1996.

Directed by Marvin V. Rush.

Created by Rick Berman, Michael Piller, Jeri Taylor.

Written by Joe Menosky, Richard Gadas, Lisa Klink.

Based on Star Trek, created by Gene Roddenberry.

Music by David Bell.

Cast: Kate Mulgrew, Robert Beltran, Roxann Biggs-Dawson, Jennifer Lien, Robert Duncan McNeill, Ethan Phillips, Robert Picardo, Tim Russ, Garrett Wang, Thomas Kopache, Carel Struycken, Patty Maloney, Tony Carlin, Shannon O'Hurley, Michael McKean, Mark Chadwick, Damaris Cordelia, Christine Delgado, Tarik Ergin, Jean-Luc Martin, Tom Morga, Louis Ortiz, Henry Reichenbach.

Star Trek: Voyager

Season 4. Episode 23.

Episode entitled: Living Witness.

Released April 29, 1998.

Directed by Tim Russ.

Created by Rick Berman, Michael Piller, Jeri Taylor.

Written by Brannon Braga, Joe Menosky, Bryan Fuller, Lisa Klink.

Based on Star Trek, created by Gene Roddenberry.

Music by Dennis McCarthy.

Cast: Kate Mulgrew, Robert Beltran, Roxann Biggs-Dawson, Robert Duncan McNeill, Ethan Phillips, Robert Picardo, Tim Russ, Garrett Wang, Jeri Ryan, Henry Woronicz, Rod Arrants, Craig Richard Nelson, Marie Chambers, Brian Fitzpatrick, Morgan H. Margolis, Mary Anne McGarry, Timothy Davis-Reed, Nancy Conn, Damaris Cordelia, Janet Dey, Tarik Ergin, Sylvester Foster, Glenn Goldstein, Fred Hafner, Tom Morga, Louis Ortiz, R. Prince, Jeff Pruitt, Shepard Ross, Steve Silverie, Martin Squires, John Alex Tampoya.

Star Trek: Enterprise

Season 4. Episode 19.

Episode entitled: In a Mirror, Darkly, Part II.

Released April 29, 2005.

Directed by Marvin V. Rush.

Written by Michael/Mike Sussman, Manny Coto.

Created by Rick Berman, Brannon Braga.

Based on Star Trek, created by Gene Roddenberry.

Opening theme song: Faith of the Heart, performed by Russell Watson.

Closing theme: Archer's Theme, by Dennis McCarthy.

Music by Kevin Kiner, Dennis McCarthy.

Cast: Scott Bakula, John Billingsley, Jolene Blalock, Dominic Keating, Anthony Montgomery, Linda Park, Connor Trinneer, Gary Graham, Gregory Itzin, John Mahon, Derek Magyar, Pat Healy, Majel Barrett, David Sobolov, Alexandrea Ortiz, Devon Abner, Kevin Derr, Glen Hambly, Michael Hugghins, Yoshio Iizuka, Andrea Lockhart, Andrew Macbeth, Nicole Malgarini, Cecelia Specht, Justin Sundquist, Michael Sussman, Chris Torres.