1: Kakashi mentioned it when he mentioned the commemorative monument in episode 5;
2: It was mentioned in the conversation between Kakashi and Uzuki Yugao in episode 80;
3: Appears in episodes 252, 319, 324, and 332;
4: Appears in episodes 339-340 of Kakashi Gaiden;
5: Episode In episode 379, Kakashi appears in a dying hallucination;
6: In episode 341, the sealed tailed beast appears;
7: In episodes 342 and 343, watch Xiaodi and Sasuke PK appears;
8: In episode 354, he stops Kakashi’s team from finding Itachi;
9: In episode 360, he is killed by Sasuke Amaterasu;
10 : 399 Memories;
11: Episodes 417-418 instigating Sasuke to kill Danzo;
12: Appearing on the window sill in Episode 422 intending to chat with Naruto;
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13: Episode 423 tells Naruto the truth about Itachi;
14: Episode 424 saves Sasuke from the Earth Shadow Dust Shield;
15: Episode Episode 437 discusses strategies to deal with the Eight-Tails;
16: Episode 440 helps Sasuke transplant Itachi’s eyes;
17: Episodes 441-442 meet Kabuto;
18: The Nine-Tails attack on Konoha occurred in Episodes 468-469;
19: Episode 471 Kisame recalls the first meeting with Obito;
20: Episode 472 -Episode 473 fights Konan, 474 takes Kabuto to the secret base;
21: Episode 475 Yamato is captured into the base;
22: Episode 476 officially begins the Ninja War;
23: Episode 483: Hiding in a place and concentrating on controlling the reincarnation of the dirty earth;
24: Episode 484 demonstrating the reincarnation of the dirty earth;
25: Episode 496: Channeling The Golem of the Outer Path;
26: The New Six Paths of Pain in Episode 503;
27: The battle with the Eight-Tailed and Nine-Tailed Begins in Episode 544;
28 : Episode 545: The battle with the eight-tailed nine-tailed jinchūriki continues;
29: Episode 549: Obito controls the six tailed beasts to fight against the nine-tailed Naruto;
30: Episode 561: The reincarnation of the dirty land is solved;
31: Episode 562: Continue to deal with Naruto, Kakashi, Akai, Hi and others;
32: Episode 563 Episode Identity Revealed;
33: Theatrical Version 6: The Successor of the Will of Fire;
34: Kakashi’s Memories;
35: Theatrical Version 9 The Road of Ninja;
Extended information:
Uchiha Obito, an important character in the Japanese comic "Naruto" and its derivative works. A member of the Uchiha clan in the Hidden Leaf Village of the Land of Fire, he is good at using skills such as the time and space ninjutsu "Kamui", Uchiha forbidden techniques, Yin and Yang escape techniques, etc. His story can be said to run through the entire main storyline of Naruto.
In the battle of Kannabi Bridge, he was crushed by a rock and was on the verge of death. He entrusted his Sharingan to his best friend Hatake Kakashi together with his wish to protect the girl he had a crush on, Nohara Rin. Later, under the conspiracy of the former leader of the Uchiha clan, Uchiha Madara, he witnessed the death of Nohara Lin and was in pain, which made Obito realize the cruelty of war. From then on, he fell into darkness and became the actual manipulator of the "Akatsuki Organization". He once assisted Uchiha Itachi. Participate in genocide. Not only did he start the Fourth Ninja War with Kabuto Yakushi, but he also became the second Ten-Tails Jinchuuriki in the history of the ninja world.
Reference: Baidu Encyclopedia - Naruto