'Scandal' Season 4 episode 14 is said to be one of the biggest, if not the biggest episode of the season, as White House will be shaken up with a nation threat. Lena Dunham is joining the cast, while Stephen appeared last week.

According to a report, a national threat will shake up the White House in the Mar. 5 episode titled "The Lawn Chair." It was said that a tragedy that takes place in Washington D.C., garnering national attention.

A sneak peek of 'Scandal' shows the situation will be something of a take-off of the Michael Brown and Darren Wilson situation that played out in Ferguson, Missouri, last year.

"Girls" star Lena Dunham will make a cameo in an upcoming episode of "Scandal" season 4. According Entertainment Weekly, Dunham will stop by to portray a role that could have a strong connection with the OPA. However, her character is still under wraps at the moment.

Dunham, who is a self-confessed fan of Shonda Rhimes, hits political thriller. She regularly references Olivia Pope and 'Scandal' in some of the episodes of her own TV series. She also mentioned Rhimes in her recent interview with Glamour magazine.

'Lawn Chair' promo trailer features "Liv winds up at a murder scene where a dad is under the impression his young, black son has been murdered by a white police officer and he wants immediate vengeance."

"I'm here to help you. I thought we could talk," she shouted.

"One of them murdered my son!" the man yelled.

However, when her body is overcome with tremor, it turns out to be Olivia that may ask of some real help from his ex-lover President Fitzgerald Grant. He may have even triggered Olivia's suddenly weakened mental state.

Previously, Olivia was saved from the terrifying kidnap scenario by her fellow Gladiator, Stephen Finch (Henry Ian Cusack).

Speaking of Stephen Finch, who appeared in season 1, has just returned in episode 13 where he saved Olivia from the terrifying kidnap. It was said that Abby was behind his big return, when she found out that she was working in Russia.

Catch 'Scandal' Season 4 Episode 14 on ABC coming this March 5.