For those still developing a taste for sci-fi, the prospect of jumping into a major franchise can be an understandably daunting one. With some of them having literal weeks worth of footage accumulated, it’s hard for a newcomer to know where to start. The beginning would seem to be the obvious answer, but that’s not always the case, especially with the numerous shows that suffered through low quality in their early days. Sometimes it can just end up turning you off a show that you might otherwise love; I know I personally had a hard time getting into both Babylon 5 and Stargate when starting from the beginning, but was able to try again with later episodes and really dig in. Other shows have just been running so long that early installments can be hard to watch with how dated they are, something a pre-existing investment in the show can help to counter. The best way, often enough, is to find a so-called “gateway episode,” one that’s enticing enough on its own to pique a viewer’s curiosity into continuing on their own.

So if you’ve found your way here and are wondering how to try out a big franchise, or if you’ve got a friend or loved one you’re eager to convince to watch with you, here are 4 big franchises and the episodes that I personally feel are perfect for introducing people to them.

4. Stargate–Thor’s Hammer

And if you can accept the Asgard’s appearance, everything else on the show is easy.

Stargate is an admittedly tough one; its first few seasons are rough, but SG-1‘s heavily arc-based nature means that the things discovered in those episodes just keep coming back and staying relevant, meaning you can’t just flat out skip them. Starting off with half a dozen bad episodes means that even dedicated sci-fi fans might be willing to write it off. Both Atlantis and Universe are controversial for different reasons, so they don’t make great starting points either (although I initially checked out Stargate due to Robert Picardo’s role in Atlantis). And the movie’s slow, boring pace and major differences from the series are definitely not a good choice for hooking someone on the franchise. So what does that leave us with?

My recommendation is a Season 1 episode, “Thor’s Hammer.” Unlike most people, I don’t think starting with a standalone episode is the best approach. A lot of the time, the episodes people recommend (“Window of Opportunity” frequently comes up) still require some knowledge of the characters, or like that episode, just flat out give a distorted view of a typical episode. I certainly wouldn’t pick something with so many repeated scenes as a first time experience. “Thor’s Hammer” makes a better first, in my opinion, because it’s more typical of the problems that SG-1 faces, and it involves many elements that will become extremely important to the series as it progresses: the Asgard, Teal’c’s symbiote and Goa’uld origins, the extent that the team will go to for each other, and shows off everyone’s talents fairly equally. I also considered “the Fifth Race,” but I feel like this one is better to start on.

3. Star Trek–Q Who?

Massive, implacable, and inscrutable. An entrancing mystery.

Star Trek has an even bigger back catalog of episodes to choose from than Stargate, and a longer history to boot. Most people would be willing to agree that while the Original Series is absolutely still worth watching today, it’s not a good place to start someone off. Cheesy effects, costumes and sets throughout, and the attitudes and styles of the day aren’t always accessible to modern audiences. It also has slightly slower pacing and much more subdued editing and camerawork than we’re used to on more recent shows. The movies generally need some degree of familiarity with the characters to fully enjoy, and that goes beyond the basic pop culture impressions of them. Deep Space 9, while highly enjoyable, spends much of its time deconstructing ideas of the Federation that were only established in the other shows first. Voyager and Enterprise? Best not to even get into that.

No, the best starting point for Trek is the obvious one: The Next Generation. TNG revived the franchise on the small screen and established the era that the other spinoffs exist in. Its first season is slow, with some truly atrocious episodes right off the bat, starting with the pilot is a bad idea. Better to start with “Q Who,” a second season episode that contains many of the major plots that resurface throughout the series. It introduces the Borg, a powerful and dangerous enemy with ships unlike anything seen before. It’s got Q, whose appearance in the pilot is one of the highlights and presence acts almost universally as a marker of a good episode. It establishes Guinan and her unusual abilities. There’s a direct challenge to Federation ideals, necessitating that Picard and the crew prove themselves. The tense atmosphere of the episode is great to pull you in, and as a single episode it does better than something like “Best of Both Worlds.” Other great episodes of TNG tend to be more philosophical or involved in ways that might be difficult for a newcomer to appreciate.

2. Battlestar Galactica–33

You’ll feel as fatigued as the crew after watching it.

While Star Trek and Stargate are series where starting from the beginning might confound your enjoyment of them, BSG doesn’t have that problem. The 2003 Miniseries is a perfectly adequate place to start, and with as heavily serialized as it is, there aren’t many opportunities to jump in later on (although you probably wouldn’t want to). Despite being a prequel, Caprica is a terrible place to start, and only a masochist would pick Blood & Chrome to start themselves on. So with that all out of the way, the only regular episode of the reimagined series that might make a good entrance point is “33.” It’s the first episode as a full series, and has an almost exhausting level of intensity to it. The dire situation that the fleet is in really hits hard, and just how outmatched they are quickly becomes apparent. The Cylons are immediately established as a threat worthy of respect, and with the characters stretched to the breaking point, what they’re made of shines through.

1. Doctor Who–Dalek

The museum of alien artifacts also helps to convey how vast this universe is.

Doctor Who is the single longest running sci-fi series ever, and the longest in terms of hours of footage. On the other hand, that means the same problems crop up as with Star Trek and TOS: extremely dated props, sets, and costumes, along with the now-rare “serial” format mean that any one story of Classic Who will take several hours and some generous suspension of disbelief. The TV Movie might seem like a reasonable place to start, but its mixed reception and the fact that McGann’s tenure was extremely short make it far less suitable. And trying to start with a spinoff like Torchwood or Sarah Jane Adventures would be a very roundabout way of getting involved, especially with Torchwood‘s uneven quality and dark subject matter relative to the parent show. No, the best way to get involved with Doctor Who for a modern viewer is with the modern version of the show.

While many people will suggest “Blink” as a good first episode, I feel like the Doctor’s absence from the episode gives a very inaccurate impression of what the rest of the series would be like. Starting off with “The Eleventh Hour” isn’t a bad choice, as the Doctor rediscovers who he is, but it still leaves a lot of important aspects out. And “Rose,” as the first episode of the revived series, works okay except for the goofy enemy in place. For that reason, I choose “Dalek” as my preferred introductory episode. It re-establishes one of the Doctor’s greatest enemies, and gives the Daleks back their intimidation that had been lost through the years as they were rendered campy and weak (more a problem for British viewers, who might have pop culture ideas of them lingering). It gives backstory on the Doctor, and shows why the role of the companion is such an important one.

My personal introduction to Doctor Who was the last 10 minutes of “Partners in Crime,” which left me a little intrigued and mostly baffled. I didn’t even know it was Doctor Who at the time. Definitely not a good choice, but it didn’t stop me from enjoying it when I eventually rediscovered the show.

So, there are my recommendations for how to introduce yourself or a friend to 4 of the biggest scifi franchises around. Do you have suggestions for other episode that you feel might work better, or perhaps have a suggestion for a different show? Let me know in the comments, or on Twitter @RetroPhaseShift. On Monday, the Primer returns! Yay! I hope…