Sam Heughan is getting support from his "Outlander" co-stars and fans, who reached out to him after he shared his experience with online abuse and harassment.

The hashtag #WeStandwithSam trended online after the Scottish star took to Twitter to talk about being a victim of online bullying and harassment for many years. Fans and cast members rallied to lend their voice and criticise those who targeted him.

Catriona Balfe, who plays Heughan's on-screen wife Claire Beauchamp Frase, shared a lengthy response in which she expressed her sadness that he had to take his frustration out on social media.

"I would have thought mean b****y behavior would have been left in the schoolyard. But unfortunately, a VERY SMALL but very vocal part of this fandom use their energy to write and say awful untrue things," Balfe tweeted and reminded online trolls to use their energy instead for something good.

"Maybe they should harness all that energy to get involved in their local charities... And honestly, it's quite simple ... If you don't like us ... it's a big beautiful world out there. Find something you do love and enjoy that. Life, as it's all too clear right now, is short. Why waste it hating," she concluded her post.

..harness all that energy to get involved in their local charities... And honestly it’s quite simple ... If you don’t like us .. it’s a big beautiful world out there. Find something you do love and enjoy that. Life as it’s all too clear right now is short. Why waste it hating.

— Caitriona Balfe (@caitrionambalfe) April 17, 2020

Likewise, Sophie Skelton, who plays Brianna 'Bree' Randall in "Outlander," expressed her support for Heughan and encouraged fans to stand together. Steven Cree, who plays Ian Murray, tweeted his sadness that someone like Heughan felt the need to post about his experience online. He considers the actor to be "truly one of the nicest and most positive people" he knows. Even "Outlander" author Diana Gabaldon chimed in and reminded everyone that the actor's private life should be kept private.

Screens don’t protect from those sticks and stones so please stop throwing them. Thankfully, there are also incredible fans out there, and thankfully we have a very close cast. Standing together. We love you, Heughan. @SamHeughan ❤️ https://t.co/pn3VppANvB

— Sophie Skelton (@SkeltonSophie) April 17, 2020

Meanwhile, other actors who expressed their support and defended Heughan include David Berry and Colin McFarlane. They each shared their messages of support for the "Outlander" star on social media.

I have just seen this & I am SHOCKED that one of the nicest humblest guys I have ever worked with has been subject to ANY kind of abuse let alone on this scale. Sorry u have had to experience this @SamHeughan & well done for speaking out. Use this to defect the trolls #Staysafe🙏🏽 https://t.co/GmEUsl9SUJ pic.twitter.com/yzymdR2q3U

— Colin McFarlane (@colinmcfarlane) April 17, 2020

The outpouring of support comes after Heughan revealed that he endured "6 years of constant bullying, harassment, stalking and false narrative." The recent claims include him "manipulating fans, being a closet homosexual, trying to mislead or extort fans for money and disregarding the COVID advice."

Stay safe all.x pic.twitter.com/9WbwAnT6nz

— Sam Heughan (@SamHeughan) April 17, 2020

Heughan said the online abuse affected his private life and mental state and has become a "daily concern." He admitted that he is "at a loss, upset, hurt" and thus he must speak out.

Outlander
Actress Caitriona Balfe (L) and actor Sam Heughan pose in the press room during the 41st Annual People's Choice Awards at the Nokia Theatre LA Live in Los Angeles. Getty Images