The Best Star Trek Time Travel Episodes, Ranked

Time travel episodes are Trek’s bread and butter. Some series use them as a crutch, others use them to tell genuinely mind-bending stories. After watching these episodes more times than is probably healthy, I’ve got strong opinions about which ones actually work. Let’s rank the best temporal adventures in Trek history.

10. “Future’s End” (Voyager, Season 3)

Ed Begley Jr. as a tech billionaire who stole 29th-century timeship technology is delightfully slimy, and Voyager in 1996 Los Angeles is pure fun. Sarah Silverman’s rain-soaked astronomer becomes an instant favorite, and the Doctor getting a mobile emitter changes the entire series. It’s not deep, but it’s entertaining as hell and gives us one of Trek’s best temporal agents in Captain Braxton. Plus, any excuse to get the crew back to present-day Earth is automatically a good time.

9. “Trials and Tribble-ations” (DS9, Season 5)

The ultimate fan-service episode, and I mean that in the best possible way. DS9’s crew gets inserted into “The Trouble with Tribbles” through some remarkable editing and effects work. Watching Sisko fanboy over Kirk, Bashir and O’Brien argue about Kirk vs. Picard, and Worf dismiss questions about Klingon appearance with “we do not discuss it” is pure joy. It’s a love letter to TOS that somehow doesn’t feel cynical. Tribbles remain undefeated.

8. “Cause and Effect” (TNG, Season 5)

The Enterprise exploding in the cold open, then Picard waking up and we realize we’re in a time loop. TNG doing Groundhog Day before Groundhog Day became the template for time loop stories. Kelsey Grammer showing up as Captain Bateson is a fun cameo, but the real genius is how the episode uses the repetition to build tension instead of tedium. That poker game scene with the déjà vu moment is perfection. Plus, Data sending himself a message through the loop is classic Trek problem-solving.

7. “Timeless” (Voyager, Season 5)

Future Harry Kim trying to fix his mistake that killed everyone on Voyager hits emotionally in a way the series didn’t always manage. Garrett Wang finally gets a meaty story, and LeVar Burton directing adds weight to the whole thing. The quantum slipstream drive failure and watching the ship crash into ice is haunting. Captain LaForge trying to stop Harry from changing history gives us that great Starfleet moral dilemma. The ending, with present-day Harry getting the future message, lands beautifully.

6. “Time’s Arrow” (TNG, Season 5-6)

Data’s head in a cave under San Francisco, Mark Twain, and Jack London walk into a bar. This two-parter is weird, ambitious, and completely commits to its premise. The 1890s San Francisco setting is gorgeously realized, and watching the crew in period costume never gets old. Data’s apparent death and resurrection plays with real stakes. Jerry Hardin’s Mark Twain is delightful, and the whole thing feels like a grand adventure in a way TNG didn’t always attempt.

5. “Time Squared” (TNG, Season 2)

The Enterprise finds a shuttlecraft containing a future Picard who’s catatonic and useless while his Enterprise was destroyed. It’s unsettling, claustrophobic, and doesn’t offer easy answers. Picard confronting his future self and making the opposite choice is Trek at its most cerebral. The episode trusts the audience to follow its logic without over-explaining. Season two TNG is rough, but this episode shows what the series was becoming.

4. “All Good Things…” (TNG, Series Finale)

Q’s final trial sends Picard bouncing between three time periods, and the anti-time paradox is genuinely clever science fiction. Seeing the crew in the past, present, and future gives the finale scope and emotion. Future Picard with dementia is heartbreaking, Admiral Riker and Captain Worf’s tension is compelling, and that final poker scene earns every bit of its sentimentality. It’s not a time travel episode in the traditional sense, but it uses temporal mechanics to deliver a perfect series finale.

3. “The Visitor” (DS9, Season 4)
Jake Sisko spending his entire life trying to save his father from a subspace accident is Trek’s most emotionally devastating hour. Tony Todd as elderly Jake is phenomenal, and the episode never lets you forget what Jake is sacrificing. The solution is heartbreaking but logical, and that final scene where Jake finds his father will destroy you every time. It’s less about time travel mechanics and more about the lengths love will drive us to. Pure emotional storytelling.

2. “Yesterday’s Enterprise” (TNG, Season 3)

The Enterprise-C emerging from a temporal rift changes history, and suddenly the Enterprise-D is a warship in a timeline where the Federation is losing to the Klingons. Denise Crosby returns as Tasha Yar, and the episode gives her character the heroic death she deserved. Guinan knowing something’s wrong through temporal awareness is a great touch. The darker, militaristic Enterprise-D is fascinating, and sending the Enterprise-C back to certain death to restore the timeline is properly tragic. This is how you do an alternate timeline story.

1. “The City on the Edge of Forever” (TOS, Season 1)

Kirk has to let Edith Keeler die to preserve history, and it remains the most gut-wrenching choice in Trek history. Joan Collins is luminous as the peace activist who can’t be allowed to delay America’s entry into World War II. McCoy accidentally changing history, the Guardian of Forever as a mysterious time portal, and Kirk falling genuinely in love with someone he has to sacrifice - it all works perfectly. Harlan Ellison’s script is legendary for a reason. The final line, “Let’s get the hell out of here,” is Kirk at his most human. This is Trek’s greatest episode, time travel or otherwise.

Time travel episodes let Trek play with consequences, explore what-ifs, and examine how choices ripple through history. The best ones use temporal mechanics to tell deeply human stories about sacrifice, love, and the weight of responsibility. They’re why we keep coming back to this franchise, even fifty-plus years later.

What’s your favorite time travel episode? Did I miss an obvious one? Let’s discuss it like civilized temporal mechanics enthusiasts.

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'Don't Touch Time' image courtesy Bill Fanning ©2025