Startrek

Edit: so IF this was a serious, genuine question and no trolling:
Stargate. Recommend. Only SG-1 and Atlantis though, haven't seen the others but I'm told it killed the franchise

Edit 2:

Start with the original 1994 feature film. Stargate was directed by Roland Emmerich, and stars Kurt Russell and James Spader. From here you’re going to move into Stargate SG-1. (The television series started three years after the feature film, in 1997, but the story picks up only one year later.) You can watch through all of this first seven seasons, which tees up SG-1‘s first spin-off series.

Stargate Atlantis premiered in July of 2004 and ran for five seasons. The two shows aired in parallel for the first three years of Atlantis, back to back on Friday nights: Season 8 of SG-1 aired alongside Season 1 of Atlantis. Season 9 of SG-1 aired with Season 2 of Atlantis; and Season 10 with Season 3.

Both shows shared the same writers room. And the writers strategically wrote these to air back-to-back on Friday nights. SG-1 would air at 8 o’clock on SCI FI Channel, Atlantis at 9 o’clock, and then Battlestar Galactica at 10 o’clock — the great “Sci-Fi Friday” lineup.
The Season 8 premiere of SG-1 is a two-parter, called “New Order.” You want to watch both of those together as a little mini-movie. Then switch over to “Rising.” The two-hour Atlantis pilot aired the following week as a two-hour movie. And “New Order” specifically sets up “Rising.”

Then, starting with the third episode of the season, you can alternate back and forth. Watch the SG-1 episode first and then the corresponding episode of Atlantis: episode 803 and 103, 804 and 104, etc. That’s how they aired, and this is going to work for you all the way through the end of this season.

The shows don’t actually reference one another all that much, and you are certainly safe watching any two-parters together. But do make sure that you watch “Moebius, Part 2” — that’s the last episode of Season 8 — before you watch “The Siege, Part 2,” Atlantis‘ Season 1 finale. You’ll see why when you get there. “Moebius” sets up an important story element for the Atlantis finale.

From here you can continue the same procedure: alternate back and forth with episodes from Season 9 of SG-1 and Season 2 of Atlantis, and then Season 10 of SG-1 and Season 3 of Atlantis. Enjoy the two-parters together. Again, there’s just a few occasional references that one show makes to the other … until you get to the tenth season of SG-1. There’s one big crossover episode.