 The visual effects supervisor for the season was Mark <unk> , with Los Angeles @-@ based visual effects company FuseFX the main visual effects vendor . Kevin <unk> started the season focused on 2D supervising , but took over as lead in @-@ house visual effects supervisor after episode eight from David Altenau . Two separate production management and creative teams were established to work on the show , with most of the episodes being worked on concurrently , either two or three at a time . 
