Charles Tucker III ( mirror ) Commander Charles Tucker III was the chief engineer on . Due to the hazardous nature of warp reactor technology , the right side of Commander Tucker ' s face was deformed , as a result of delta radiation exposure . The deformity was so extreme that it would make sure his " grandchildren glow in the dark . " Tucker was very attracted to and even did her an enjoyable " favor " while she was enduring the " pon farr " . While under the influence of a mind meld with T ' Pol , Tucker unknowingly sabotage d the Suliban cloaking device that he had previously installed on " Enterprise " . It turned out that T ' Pol was using him to help Captain Forrest regain command of the starship . As a result , he spent four hours in the agony booth . He was incensed when T ' Pol told him what she had done . Unlike his prime universe counterpart , Tucker was not friendly or easy going . He was mean spirited , short tempered with his subordinates , cynical and highly suspicious of others to the point of paranoia at times . He and Major also hated each other . Tucker was infuriated when Commander had Reed and his detachment investigate the sabotage of the Suliban cloaking device , instead of allowing the engineering department to investigate . When Tucker was later thrown in the agony booth by Archer , Reed took great pleasure in overseeing Tucker ' s torture , and taunted him over his predicament . Tucker was a member of the assault team that boarded the . When the " Enterprise " was destroyed by the Tholian s , Tucker worked together with T ' Pol , Reed and Archer to power up the Defiant , escape the Tholian base and destroy the Tholian ships . Archer assigned Tucker as chief engineer on board " Defiant " , but ran into problems almost immediately . The " Defiant " was not fully operational in that warp drive was off - line . To make matters worse , Tucker had no idea how to get the warp drive operational , as " Defiant " was from one hundred years in the future and Tucker was in no way familiar with this futuristic technology . Archer was less than sympathetic when Tucker explained this to him , ordering him to get the ship fully operational soon or he would find another chief engineer . T ' Pol suggested that Tucker use the alien workers found on board to help him , as they might be more familiar with the " Defiant " s technology . Tucker ' s dilemma was further compounded when it was determined that Slar , a Gorn foreman that the Tholians used to work on the ship , was stealing key engine components and was killing members of the engineering department . Eventually , Archer hunted down and killed Slar . Subsequently , the components were found and Tucker was able to get the warp drive online so the " Defiant " could rendezvous with the other Starfleet vessels that were battling the rebel forces . Later , Tucker was instrumental in saving the " Defiant " from being destroyed by the . Tucker had found sabotaging key ship components such as shields and weapon s systems in order to give " Avenger " a significant advantage . Tucker managed to overpower Phlox and restore shields and weapons systems . His actions were paramount in allowing the " Defiant " to eventually overtake and destroy " Avenger " . ( )