On this day in the Star Trek universe - Voyager, Enterprise:

Star Trek: Voyager (1999)
Star Trek: Enterprise (2004)

Star Trek: Voyager
Season 5. Episode 24.

Episode entitled: Warhead.

Released May 19, 1999.

Directed by John Kretchmer.

Created by Rick Berman, Michael Piller, Jeri Taylor.

Written by Michael Taylor, Kenneth Biller, Brannon Braga, Bryan Fuller, Nick Sagan.

Based on Star Trek, created by Gene Roddenberry.

Music by Jay Chattaway.

Cast: Kate Mulgrew, Robert Beltran, Roxann Dawson, Robert Duncan McNeill, Ethan Phillips, Robert Picardo, Tim Russ, Garrett Wang, Jeri Ryan, McKenzie Westmore, Steve Dennis, John Austin, Sylvester Foster, Maya Fujimoto, Kerry Hoyt, Tony Jones, Pablo Soriano.

Star Trek: Enterprise
Season 3. Episode 23.

Episode entitled: Countdown.

Released May 19, 2004.

Directed by Robert Duncan McNeill.

Written by André Bormanis, Chris Black.

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, Scott MacDonald, Rick Worthy, Tucker Smallwood, Josette Di Carlo, Bruce Thomas, Andrew Borba, Mary Mara, Ruth Williamson, Steven Culp, Paul Dean, Alexandrea Ortiz, Jeff Bodean, Solomon Burke Jr., Daphney Damaraux, Kevin Derr, Yuri Elvin, Tarik Ergin, Ian Eyre, Glen Hambly, Tamara Hambly, Andrew Macbeth, Dorenda Moore, Michael O'Laskey II, Lidia Sabljic, Paul Sklar, Ator Tamras.