Yes, "Thor: Ragnarok" is the third movie in the Thor film series, released in 2017. It follows Thor, played by Chris Hemsworth, as he faces the powerful goddess Hela, played by Cate Blanchett, who threatens to destroy Asgard. The film features a unique blend of humor and action, directed by Taika Waititi, and introduces new characters like Valkyrie and the Hulk in a vibrant, visually striking setting. It is part of the Marvel Cinematic Universe (MCU) and contributes significantly to Thor's character development.

As of October 2023, "Thor 5" has not been officially confirmed by Marvel Studios. While there has been speculation about the future of the Thor franchise following "Thor: Love and Thunder," no definitive announcements have been made regarding a fifth installment. Director Taika Waititi and actor Chris Hemsworth have expressed interest in continuing the story, but fans will need to wait for official news from Marvel for any updates on "Thor 5."

Scarlett Johansson did not appear in "Thor: Ragnarok." Instead, she is known for playing Natasha Romanoff, also known as Black Widow, in the Marvel Cinematic Universe. In "Thor: Ragnarok," the character of Valkyrie is played by Tessa Thompson, and Thor is portrayed by Chris Hemsworth. The film, directed by Taika Waititi, features a mix of humor and action as Thor teams up with Hulk and Valkyrie to escape from the Grandmaster and save Asgard.

In "Thor: Ragnarok," Hulk is on Sakaar, a distant planet, due to the events following "Avengers: Age of Ultron." After transforming into the Hulk, he decides to remain in his Hulk form, avoiding turning back into Bruce Banner for two years. On Sakaar, he becomes a gladiatorial champion, fighting in the Grandmaster's arena. Thor encounters Hulk when he is captured and forced to fight in the arena, leading to their eventual alliance to escape Sakaar and confront Hela, the villain threatening Asgard.