If you by returning mean "coming back from death:", then the first time we see Nagato again is manga chapter 490, in which Kabuto shows Madara he can use "Impure world ressurection" to bring all the dead Akatsuki members back to life. This chapter has not been animated yet.
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he meets the real pain aka nageto on ep 172
Hatake Kakashi does die fighting pain. But after Naruto defeats all of the bodies of Nagato (who is the actual person controlling the six other bodies) and Naruto goes to talk to Nagato. After they talk and Naruto hears Konan, Nagato, and Yahiko's story, he gives Nagato his answer to finding peace. Nagato is changed and uses his last bit of energy to bring back to life everyone that was killed in the attack on Konoha. That includes Kakashi! So Kakashi is brought back to life. it is in naruto shipudden episode 159!!!
technically yes ,because madara uchiha said that nagato is from the uzumaki clan just like the mother of naruto so it is plausible
Hidan Is First Seen In Naruto Shippuden Episode 10 Only In Hologram.Hidan is Seen Again In Episode 71 In Person.Kakuzu:Naruto Episode 135 (Hologram)Naruto Shippuden Episode 10 (Hologram)Naruto Shippuden Episode 71 (In Person)The Only Reason Hidan Wasn't Mentioned In Naruto Episode 135 Is Because He Wasn't In "Akatsuki" Yet.
Your question isn't direct enough. What season of Naruto? (The Original or Shippuden?) and return to where? He shows up multiple times.