Simon has been starring on the show in a lead role from the very beginning. Other acting jobs he has done include recently acting as Cosme McMoon in the movie “Florence Foster Jenkins” alongside Meryl Streep and Hugh Grant.
He also played the voice of Bian Zao in “Kung Fu Panda: Legends of Awesomeness” from 2011-2016. He makes $750,000 per episode, which is less than what other leads make, however still very admirable.
Mayim Bialik as Amy Fowler – Now
Mayim started acting at age 12, eventually landing her most famed role as Amy in TBBT. She is a neuroscientist in real life, so playing the role wasn’t much of a change.
When the actress is signed on for the 12th season, she received a raise and now earning $500,000 per episode. She now stars as the titular character in another sitcom titled "Call Me Kat."
Simon Helberg as Howard Wolowitz – Then
Simon plays the role of Howard, who is an aerospace engineer and astronaut who has made impressive scientific gains. Howard’s mother is very overprotective.
At the start of the show, Howard hangs with everyone at Leonard and Sheldon’s apartment. During season 3, he meets Bernadette, who worked at the time at The Cheesecake Factory with Penny and was pursuing her Ph.D. in microbiology. Howard and Bernadette make it official in season 5 and have two kids — Halley and Neil.
Laura Spencer as Emily Sweeney – Then
Emily, who works as a dermatologist, met Raj during season 7 on his online dating site. Raj dates Emily and Lucy at the same time. Emily isn’t bothered by it, but Lucy is. Raj likes Emily because of her sadistic sense of humor and fondness for horror films.
Raj and Emily date seriously, with Raj eventually breaking up with her to be with Claire. At one point, Raj dates Emily and Claire at the same time and then breaks up with both girls during season 10.
Laura Spencer as Emily Sweeney – Now
Laura played Emily in TBBT while also playing the role of Jessica in "Bones." She also played the role of Christine in the short 2017 film "Vitality."
After "Bones," the actress's appearances became few and far between, but she hasn't gone off the radar completely.