Grat Colonel Grat was a Tandaran military officer in charge of Detention Complex 26 , a prison on a moon in Tandaran space , where dozens of innocent Suliban were held during the Tandarans ' conflict with the Suliban Cabal . In 2152 , a carrying officers Captain Jonathan Archer and Ensign Travis Mayweather was shot down by Tandaran ships when they accidentally entered the moon ' s military zone . They were detained and questioned by Grat , and although he believed they were not affiliated with the Suliban , he could not release them , citing strict regulations preventing him from doing so . Grat told the two Starfleet officers that they could appeal to the Central Magistrate ' s Office for their release before Grat could let them go , and that they were not permitted to contact " Enterprise " . He stated that a transport would arrive to take them to Tandar Prime in three days , but until then , they could not leave or communicate outside the detention complex . Later , Grat contacted " Enterprise " using an untraceable triaxilating channel and informed the crew of the situation . He also told them they could not speak with the imprisoned officers , but sent the ship coordinates for Tandar Prime so that they could attend the hearing of their crewmates . Having learned from Archer that " Enterprise " had prior encounters with the Suliban Cabal , Grat took it upon himself to contact Tandaran intelligence , who relayed to him information regarding the events surrounding the Broken Bow Incident , including news that the Cabal had made attempts to capture a Klingon named Klaang , and that Archer had had contact with a former Cabal member named Sarin as well as having had an encounter with Silik . Believing Archer had valuable information on the Cabal and who they were working for , Grat brought the captain in for questioning . The captain refused to be interrogated , however , and instead asked why the Tandarans had detained Suliban who were not members of the Cabal . Grat claimed the Suliban were imprisoned for their own protection , to prevent them from becoming innocent casualties of war and to ensure they could not be recruited into the Cabal . Grat then persisted in questioning Archer for further information on the Cabal and his involvement in the Temporal Cold War . When Archer stood his ground , Grat threatened him with a longer stay in the detention complex . Grat later contacted " Enterprise " to inform the officers aboard the ship that their crewmates ' hearing had been " postponed . " This time , however , Communications Officer Hoshi Sato was able to isolate Grat ' s frequency and T ' Pol ordered " Enterprise " to proceed to the location of the detention complex . When " Enterprise " assumed orbit around the moon , Grat threatened the vessel ' s crew . However , he could not prevent Archer and Mayweather finally escaping , along with the detained Suliban , of whom there were eighty - nine individuals . Stealing a Tandaran pistol from Grat , Archer locked him in the facility ' s isolation cell . ( ) Later that year , while vacationing on planet Risa , Archer suspected that a disguised Tandaran named Keyla Terrana was an agent of Colonel Grat sent to retrieve information from Archer . Keyla denied the accusations , claiming she had never even heard of Grat . Before Archer could question her further , she knocked him unconscious and escaped . ( ) Background information . Grat was played by Dean Stockwell , who had co - starred alongside Archer actor Scott Bakula in the television series " Quantum Leap " ; they had appeared together as the two main characters in that show . In the final draft script of " Detained " , Grat was described as being " in his 50 ' s . " The teleplay went on to comment , " " He ' s an affable , cultured man who also harbors deep resentment toward the Suliban . " " Rather than Grat being locked in a cell at the end of the story , the script featured him ultimately hatching a plan to take Archer , in Grat ' s shuttle , to Tandar Prime and question him there though then being cold - cocked by Reed , with Grat ' s own Tandaran pistol . The role of Grat , which was not especially written for Dean Stockwell , was prompted by Scott Bakula and the producers of agreeing that having Stockwell in their series would be a good idea . Said series co - creator and Executive Producer Rick Berman , " " When an appropriate role came along we contacted Dean , and he was delighted to do it . " " ( ) Dean Stockwell struggled with some of Grat ' s dialogue . One week after " Detained " wrapped production , Scott Bakula commented , " " He got stuck with having to recap a lot of history from the first season , in particular about the Suliban , and he was like : ' You have the Suliban , and he ' s a Tandaran . ' It was so great , but he looked at me like , ' What am I talking about ? What is this all about ? So you have Suliban , Tandaran , Barathan , Pilgrims ? ' and he didn ' t know which end was up ! " " ( ) The portrayal of Grat thrilled Brannon Braga , who created " Star Trek : Enterprise " together with Rick Berman and also served as an executive producer on the series . Braga enthused , " " Dean did an amazing job . " " ( )