Krypton is often called a prequel series, but the word doesn't really fit. Krypton's premise and plot are dependent upon time travel. Adam Strange (Shaun Sipos) travels back from the present to make sure things unfold as they should. He brings Superman's cape with him, and the cape disintegrates as time goes haywire. By the end of the first season, the cape has completely reappeared, but bears the sigil of House Zod. 

There are some strange things about Krypton being, essentially, a non-prequel prequel. Perhaps more than anything, there's the relationship between Seg, Lyta-Zod (Georgia Campbell), and General Zod, a.k.a. Dru-Zod. You eventually learn in the first season Seg and Lyta are Zod's parents, which is just... weird. The parents never seem to have a difficult time adjusting to this new information. They immediately start speaking to Dru as if they care for him as much as any boy they raised even though they just met him. And it's a little jarring that Colin Salmon, who plays Dru-Zod, is three decades older than the actors playing his parents. 

Once Dru assumes leadership of the planet in season 2, no one has a problem accepting he's a time traveller. In the first season acknowledging there might be intelligent alien life in the universe is considered heresy, yet in season 2 everyone is fine with their leader claiming to be a time traveller whose parents are young enough he can probably give them a bedtime.