* In the Solar System: If you're talking about the planets, then after Jupiter comes Saturn.

* In the alphabet: If you're talking about letters, then after "J" comes "K".

* In a list or sequence: You need to tell me what the list is about! For example, if you're talking about the planets in order from the sun, the sequence goes Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Please give me more context so I can give you the right answer!