Fred Savage has explained his non-attendance at The Princess Bride's online cast reunion, where more than 60,000 people tuned in as the stars gathered to rally support for the Wisconsin Democratic Party's call to elect Joe Biden as US President.

The Wonder Years star put a post on social media, saying that he could not attend as he was celebrating his brother's 40th birthday. The only other actors who were not at the reunion were those who had sadly passed away.

Savage wrote: "Wanna feel old?? My baby brother is 40!! Had so much fun celebrating with him last night! ...and while I'm always proud to be part of the Princess Bride family, sometimes real-life family comes first."

Cast members joined the reunion from their homes, acting out the beloved 1987 classic. The event was organised by Cary Elwes, who played Westley opposite Robin Wright's Princess Buttercup and Mandy Patinkin's Inigo Montoya.

Guest stars stepped in for other roles, with Finn Wolfhard playing Savage's grandson role. Josh Gad filled the late Andre the Giant's massive shoes as Fessik, and Princess Bride director Rob Reiner did a convincing job as the grandfather, originally portrayed by the late Colombo star Peter Falk.

The event was planned by Elwes in collaboration with the Wisconsin Democratic Party and also starred guests Whoopi Goldberg and Eric Idle, as well as original cast members Christopher Guest, Chris Sarandon, Wallace Shawn, Billy Crystal and Carol Kane.

Highlights included Elwes donning a medical mask for the line: "It's just that masks are terribly comfortable - I think everyone will be wearing them in the future" and Patinkin's entire performance, during which he brandished the very sword he used during the filming of the original movie.

US President Donald Trump's spokesperson Anna Kelly told the Hollywood Reporter that she was not worried that the reunion of the cast would sway votes in the swing state of Wisconsin, saying: "Unlike the movie, we know what inconceivable means and a Biden victory in Wisconsin is simply inconceivable."