Clarke (Eliza Taylor) may finally be out of danger of losing her body to Josephine, but the rest of our heroes still left in Sanctum are in grave peril when The 100 returns this week.

After so many dead Primes and a near mass-execution, Clarke, Bellamy (Bob Morley), Octavia (Marie Avgeropoulos), and Gabriel (Chuku Modu) have their work cut out for them getting their people safely out of danger. In this exclusive sneak peek of Tuesday's episode, the foursome argues about how best to achieve that and who they're willing to sacrifice in order to make it happen.

As Gabriel explains the origins of his exile from Sanctum, in which he burned the nightblood embryos that would have been used as hosts for the Primes, things get heated between the Blake siblings. What was already a tense discussion turns into a sibling bickering match as they debate the pros and cons of Gabriel being unwilling to kill his own people. At one point, Bellamy even goes for the low blow and calls Octavia the "Queen of Cannibals."

Discover Your New Favorite Show: Watch This Now!

So harsh, Bellamy! Has this sibling dynamic finally reached the point of no return?

The 100 airs Tuesdays at 9/8c on The CW.

(Disclosure: TV Guide is owned by CBS Interactive, a division of CBS Corporation.)

Marie Avgeropoulos, <em>The 100</em>Marie Avgeropoulos, The 100