"The 100" season 3 episode 7, titled "Thirteen," will see Lexa (Alycia Debnam-Carey) face the consequences of her actions thus far as the rest of the Grounders begin to question her leadership. According to the official synopsis from Cartermatt, Lexa will need to prove she can truly separate her feelings from her responsibilities.

The synopsis states that Lexa will need to keep the clans under control as many begin to question why she isn't thirsty for revenge against the Sky People ever since Pike (Michael Beach) and Bellamy (Bob Morley) caused the massacre against the Grounders in season 3. 

Scenes from the promo trailer showcase the Grounders declaring that Lexa's leadership decisions are being clouded due to  her feelings towards Clarke (Eliza Taylor), now known as the Wanheda. Lexa is seen rebuking this notion, stating she is capable of separating her feelings from her duties. 

While Lexa and Clarke try to prevent the Grounders from causing a riot, which could in turn overthrow Lexa from the leadership position and start a war against the Sky People, the episode will also reveal a few flashbacks that will finally explain how the Grounders became who and what they are. 

These flashbacks may cover how the Grounders eventually formed their community, how their ancestors survived the nuclear apocalypse or how the tribes waged war against the people of Mount Weather. These flashbacks are stated to showcase the origin of the Grounders' culture and beliefs.

According to the synopsis, this is noted as one of the "darker chapters" in human history. Fans will recall that the Grounders were the descendants of people who were on Earth but somehow managed to survive when the nuclear war destroyed the planet. During the first seasons they proved to be the main antagonists against the Sky People.

"The 100" season 3 episode 7 will air this March 3.