"The Hobbit: Battle of Five Armies" cast Sir Ian McKellen received honorary doctorate from University of Cambridge in England as he realized sitcom ambition with "Vicious."

In his Facebook page, "The Hobbit: Battle of Five Armies" cast Sir Ian McKellen wrote, per E! Online:

"I am now an honorary Doctor of Letters at Cambridge University UK. My old college St Catharine's celebrated by flying the rainbow flag."

Sir Ian McKellen, who studied English literature at Cambridge, already received a honorary doctorate from the University of Ulster in Ireland last year, the website added.

Meanwhile, "The Hobbit: Battle of Five Armies" cast Sir Ian McKellen, 75, will be seen in a sitcom with another 75-year-old, Derek Jacobi in "Vicious" which debuts Sunday on PBS.

Produced by Gary Janetti, the six-episode comedy is about two septuagenarian gay partners and their adventures together and has been a hit among audiences in Great Britain.

Sir Ian McKellen, who plays Gandalf in "The Hobbit: Battle of Five Armies," told Sioux City Journal that he didn't think that somebody will offer him a sitcom because of his advanced age but he confessed that being on the boob tube has "been a sort of ambition of mine."

The publication said that Sir Ian McKellen plays a "hammy actor" who accepts any role in TV shows and plays hoping to get that big break. He has been shacking up with Derek Jacobi who has been his partner for 49 years.

However, their partnership is anything but smooth as familiarity as well as their age means they constantly fight even on the littlest things. Iwan Rheon plays their young neighbor who always seeks their advice, thus "giving them a chance to see the world from another perspective."

Derek Jacobi chimed in on "Vicious," according to Star Tribune: "I think one of the reasons for the success of these shows is that the public is gagging for programs featuring people who are older. Until now, television and film were obsessed with youth and beauty. It's very refreshing - and certainly very good for us and our bank balances - to be in your 70s and still be asked to perform in such well-written shows."