
There's a lot going on in "The Arachnitects," pursuing three distinct ideas across its 22-minute timespan: Tribor's departure from the Combo Pack to rebuild the resistance, everyone else's journey to activate a Dimensional Key after Mooncake gets mysteriously taken hostage in another dimension, and the offering of a heavy dose of world-building mythology. It's a surprising change of pace for the season, presenting itself as a detour through and through, but an incredibly important one, and against all odds, it's probably the most crucial piece of the puzzle to Season 2's elaborate narrative yet.
Of everything about "The Arachnitects" that needs to be tackled, perhaps the best place to start (as the episode does) is by discussing Tribor. Ever since being rescued in "The Happy Place," there's been a sense that he was destined for something else, with his limited contributions to the episodes that followed leaving the series' intentions of having him involved fairly dubious. The reveal that he chooses to leave the crew and forge his own path, in that sense, checks out, and it seems to promise that he'll offer a more exciting presence. Unfortunately, though, not much of that really shows here.