Although Phlox allowed Captain Jonathan Archer, commanding officer of Enterprise, to observe the worms in 2151, Phlox told him not to shake them. (ENT: "Broken Bow") The immunocytic gel worms were created using computer-generated graphics. Initially an exotic-looking tropical fish called Oliver was considered for the role, but it did not look strange enough. ("Broken Bow" text commentary, ENT Season 1 DVD)