The promo video clip of 'Scandal' Season 4 Episode 15 titled 'The Testimony of Diego Munoz' hints that the past eventually comes out and will haunt everyone involved with the workings of the White House.

According to Christian Post, in the upcoming episode of the political thriller television series, fans will see an unexpected guest giving some shocking news to David Rosen (Joshua Malina). The former gives him some appalling insider news claiming that B613 may possibly wipe out President Fitz as well as the remaining gladiators.

The trailer for 'The Testimony of Diego Munoz' also suggests that Olivia Pope (Kerry Washington) and the remaining gladiators are deeply concerned about the contention that lie in waiting before them in case the hidden dreadful secret is revealed.

In the promo, Olivia is seen saying, "I was kidnapped and held hostage by a team of mercenaries." Subsequently, Jake (Scott Foley) reminds someone the gravity of the situation, saying that "these files could bury all of us" provided its contents containing secret of B613 come out in the open. On the other hand, Huck (Guillermo Diaz), who appears to be distressed, asks, "You want us to find the body?"

Before the trailer ends, viewers see Olivia appealing to Fitz, saying, "Go to the hill and beg them to forgive you." She probably says this with a view to save Fitz's presidency as well as her remaining associates from being doomed completely.

In the meantime, supporters of Mellie (Bellamy Young) are likely to find their favorite first lady in the spotlight soon.

Talking to TV Guide recently, Bellamy Young, who portrays the character of President Fitz's wife, discussed about how Mellie will be transformed from being a grief-stricken mother to someone who can overturn her powerful husband.

Young teased, "She sees the next move on her chess board and embraces it. She feels she's paid her dues, is able and is certainly willing and definitely ready in her own mind. She has always been doing the right thing, being the partner to the person in charge and waiting for her moment to come after his term, and she can have her political life."

'Scandal' Season 4 Episode 15 titled 'The Testimony of Diego Munoz' airs on Thursday, March 12, on ABC.