Biografia

His biological father is actually Michael Tell, whom Patty Duke was married to for less than a month in 1970. Sean was adopted at age 3 by John Astin, but considers both men to be his father.

Had to gain 35 to 40 pounds for his role of Samwise 'Sam' Gamgee in the "Lord of the Rings" trilogy.

Because Sean's mother was bi-polar, Sean is very active in trying to educate and help the public with identifying and treating mental disorders.

During a break in principal photography from the "Lord of the Rings" trilogy, Astin directed trilogy director Peter Jackson and fellow cast members in a five-minute short film, The Long and Short of It (2003), about camaraderie and friendship within difficult working environments, which mirrored a significant theme of the trilogy. Astin was able to borrow a cutting-edge digital camera from Lucasfilm representatives (who had been demonstrating the camera for Jackson) for a day to make the short. The film was included as a bonus on the DVD release of Il Signore degli Anelli - Le due torri (2002).

In I Goonies (1985), his character cries out "Holy Mackenzie!" His brother is Mackenzie Astin. He claimed he was allowed to keep the treasure map used in the film. However, the map was lost forever when his mother discovered it several years later, thought it was just a crinkled piece of paper, and threw it in the trash.

I was told I had to gain a lot of weight because Hobbits are very portly. Peter [Peter Jackson] is forever suggesting I have more food: "A little more food for Mr. Astin."

[refuting the remarks of cast and crew that he IS Samwise Gamgee] But I'm not really Sam . . . nobody could be that good, that noble. He's just better than the rest of us. I'm a lot more Hollywood than Sam would ever be.

I'd never heard of the "Lord of the Rings", actually. So I went to the bookstore and there it was, three shelves of books about Tolkien and Middle-earth, and I was like, "Holy cow, what else am I missing out on?"

[12/18/03, about the scene in Il Signore degli Anelli - Il ritorno del re (2003) in which Sam helps Frodo up Mount Doom] It was an incredible acting experience, being on the side of a volcano with that language. That language is so beautiful: "It'll be springtime soon, and they'll be sowing barley on the fields." When Peter [Peter Jackson] came up to tell me to lower my arm, something like that, tears were streaming down his face, and to see him that emotional just forced me into it . . . It [finally seeing the last three reels of the film] was a huge cry. It was all of the tension and stress and pressure of having a wife and children, having a career, the investment of these movies. I was sobbing and heaving, I could barely breathe, and the movie facilitated that. It was just a huge release.

[12/14/03, on his character Sam Gamgee] I spent the film doing lots of things, but the crying is what lived. He [Peter Jackson] tricks you into thinking you're going to get to do all these brave, heroic things most of the time, and you have to cry once in a while . . . and then he cuts out the heroic moments and you're left thinking, "I look like a big baby".