little else, but Reed reveals his location as Qu'Vat; Harris contacts Krell, to inform him that Enterprise is on the way, and Krell reveals that he used Harris. Enterprise arrives at the colony, and Archer beams down to the base with Marab to confront the Klingons and Phlox. Krell's Klingon battlecruiser and two Birds of Prey arrive in orbit and Krell orders the ships to destroy the colony. Enterprise attempts to intervene but is engaged by the Birds of Prey. Columbia arrives and joins combat with the two Birds of Prey, while Enterprise impedes the battlecruiser. Meanwhile, Phlox infects a voluntarily restrained Archer, as he needs human antibodies for the cure. Antaak then transports a canister of the virus onto the battlecruiser which infects the crew, including Krell. Needing the cure from Phlox, Krell stands down the attack and the Klingon High Council soon agrees to distribute the cure throughout the Empire. Harris contacts Reed, thanking him and confirming that the plan proceeded as per Section 31's projections, stabilizing the leadership of the Klingon Empire while scaring it off from augment experimentation. Production Filming began on December 14, 2004 and ran for four days before the cast and crew went on a two-week break over the holiday period. The production overlapped on December 16 with second-unit filming on the episode "United", which required most of the main cast with the exception of Billingsley as Phlox. The opportunity was taken to film the majority of the sequences with Phlox, K'Vagh and Antaak at the same time on a different sound stage so as to not delay the production. After the break, production resumed on January 3, 2005. Minimal shooting was conducted on the first day for "Divergence", as further second-unit filming took place in the afternoon for "United" and for "Babel One". On the second day, Eric Pierpoint and Wayne Grace filmed their scenes as they both appeared on only one set each. Whilst filming was scheduled for seven days, the second-unit filming for "Divergence" pushed into an eighth day on January 6, which overlapped with the production of "Bound". Judith and Garfield Reeves-Stevens joined the staff as writers during season four. Prior to "Divergence" they had already written the episodes "The Forge", "Observer Effect" and "United". The Reeves-Stevens said of "Divergence", "we've written a multiple-starship action sequence that's never been seen before, and that everyone's very excited to bring to