“Did humans really talk like that?”: A Piece of the Action (TOS) vs. The Royale (TNG)

Away teams from two Enterprises encounter echoes of Earth’s past on far-off planets … and also cheat at craps (and fizzbin).

“I’m literally angry with rage!”: The Squire of Gothos (TOS) vs. Where No Fan Has Gone Before (Futurama)

The crew of the Enterprise meet Earth’s biggest fan, and the cast of the show meet Star Trek’s biggest fan.

“There’s coffee in that nebula”: The Corbomite Maneuver (TOS) vs. The Cloud (VOY)

Kirk and Janeway put their morals where their mouths are, risking ship and crew to show that the Federation’s values aren’t just words.

“What are you, that you could do this?”: The Enterprise Incident (TOS) vs. Face of the Enemy (TNG)

Troi and Kirk try on Romulan faces, and oppression and espionage test what Troi and Spock are capable of.

“There’s got to be something better than this”: Mirror, Mirror (TOS) vs. Crossover (DS9)

In Trek vs. Trek’s first trip to the Mirror Universe, we see how differently the Original Series and Deep Space Nine approach the idea of ‘the darkest timeline’.

“I feel angry, but I want to love”: Journey to Babel (TOS) vs. Sarek (TNG) vs. Lethe (DSC)

Spock and Burnham have daddy issues, and Sarek is emotionally exhausted from appearing in 3 different series of Star Trek.

“I’m a doctor, not an historian”: The Trouble with Tribbles (TOS) vs. Trials and Tribble-ations (DS9)

The Original Series gives us a comedic classic, and Deep Space Nine pays tribble-ute with a comedic classic of its own.

“Tell your threat-ganglia to relax”: The Devil in the Dark (TOS) vs. The Butcher’s Knife Cares Not for the Lamb’s Cry (DSC)

Kirk and Spock hunt one supposed monster, and Burnham is ordered to weaponize another.

“Above all else, a god needs compassion”: The Cage (TOS) vs. Where No Man Has Gone Before (TOS)

The series so nice they made a pilot, twice

“Right, but at the wrong time”: City on the Edge of Forever (TOS) vs. Past Tense (DS9)

Kirk and Spock come to some horrible realizations, in a timeless classic; Sisko and Bashir make some disturbing observations, and give us a timely warning.