Caysin Bog Caysin Bog was a humanoid male from a high - gravity world . He was blown apart in an insurgency strike on the moon Jedha , only to be surgically pieced back together by a surgeon calling himself Roofoo . Bog was present in Jedha City in 0 BBY and witnessed an attack by the Partisans on an Imperial patrol shortly before the city was destroyed by the Galactic Empire ' s Death Star superweapon . Bog managed to avoid being killed by the Death Star and following the Battle of Yavin , he was working as a mercenary with his lover Tam Posla . The pair accepted a job from the Son - tuul Pride crime syndicate to travel to the planet Skako Minor under the command of Doctor Chelli Aphra . Once on the world , the mercenary group was led into an Imperial trap by the Skakoan Hallio Bas ; however , Aphra managed to kill Bas and the Imperials with an exploding tooka . The group then made their way inside the lab , where they were attacked by another group of Imperials led by Magna Tolvan . The arrival of the Imperials disrupted a techno - totem that triggered the awakening of a chthonic worm god , that then attacked Bog and his allies . The mercenaries chose to hide in cover rather than fight the beast as it was not covered by their contract . After the mercenary droideka Dek - Nil killed the beast by collapsing the roof of the lab , Bog and the others looted the lab and then returned to their shuttle . Biography . Bad luck on Jedha . A male humanoid originating from a high - gravity world , Caysin Bog was blown apart during a raid by the Partisans , a rebel group led by the insurgent Saw Gerrera , on the moon Jedha . He survived his injuries thanks to the work of the surgeon Cornelius Evazan , who , under the alias Roofoo , pieced Bog back together using techniques similar to those he used to create the subservient Decraniated cyborg s . With Bog himself noting that he served as a prototype for the Decraniated . In the year 0 BBY , Bog was present in Jedha City and stood to the side of a street near Gesh ' s Tapcafe to make room for an oncoming Imperial patrol that included a TX - 225A Occupier tank . As Bog waited for the patrol to pass , a group of Partisans ambushed the Imperials and began hurling explosives at them , causing the nearby civilians to scatter in fear . The Imperial forces were evacuated from the city shortly after , allowing the Galactic Empire to destroy the settlement with the Death Star superweapon . Merc work . Bog managed to escape Jedha City prior to its obliteration , and following the destruction of the Death Star by the Rebel Alliance at the Battle of Yavin , he was working as a mercenary alongside the former Milvayne Authority officer Tam Posla , with whom he was in a romantic relationship . Posla was obsessed with hunting down Evazan for his crimes , and was using pay from his mercenary work in order to fund this goal . The pair were amongst several mercenaries who accepted a job to travel to the planet Skako Minor for the Son - tuul Pride criminal syndicate on the planet Son - tuul . The group waited for their leader Doctor Chelli Aphra in a patrol transport near a settlement on Son - Tuul and while in the vehicle , Bog and Posla sat together holding hands as Posla listened to music . When Aphra arrived she scanned and read up on each member of her new crew , noting Bog ' s history with Evazan and his relationship with Posla . A trap on Skako Minor . Before the group could leave for Skako Minor , Aphra was tasked with choosing one member of the team to leave behind , as together they weighed too much for the ship to take off . When Imperial forces began surrounding the transport and demanding its occupants disembark , the doctor ordered Viscount Rabael Dir Glorio to prevent them from reaching the ship ; however , as the viscount fought against the Imperials , Aphra pilot ed the ship with Bog and the others on - board away and left Glorio behind . Upon reaching Skako Minor , the group began following their Skakoan guide Hallio Bas , whom they believed was going to lead them to the workshop of deceased Techno Union leader Wat Tambor . Instead , Bas led them to a clearing full of Imperial stormtrooper s with whom he had a deal to bring looters . Before the Imperials had a chance to execute Bog and his comrades , Aphra begged that they spare her pet , the genetically spliced tooka clone Flufto . Bas took the pet from her in order to later eat it , after which the doctor uttered a code phrase that caused the tooka to explode and kill the Imperials and Bas . From one trap to another . Bog and the rest of the mercenary team survived the explosion unscathed , and as they regrouped one surviving stormtrooper attempted to flee . The cyborg mercenary Rexa Go ordered Bog and Posla to stop the trooper from escaping , but the pair refused , reasoning that the alarms were already triggered and so there was no need to kill someone who had broken no law . The Defel Glahst Ombra then killed the trooper instead , after which the mercenary team all moved inside Tambor ' s lab . Inside the lab , Bog ' s attention was drawn to a sparkling techno - totem on display , which he reached out to touch ; however , Aphra screamed for the cyborg to stop , as she suspected that the totem was a trap . Her fears were confirmed when , moments later , an Imperial " Delta " - class T - 3c shuttle crashed through the wall of the laboratory and landed on the sparkling object . Stormtroopers led by Magna Tolvan then emerged from the shuttle and opened fire , forcing Bog and the others to take cover . Bog and the beast . The shuttle ' s disturbance of the totem triggered the awakening of a Chthonic worm god , which then erupted from the floor beneath the lab and attacked Imperials and mercenaries alike . Bog and Posla retreated to a different piece of cover , where Aphra order Bog to use his bayonet to harm the god , who was targeting any weaponry it could reach with its tentacles . Posla then advised Bog to ignore the order , as their contract only covered entering and holding the facility . Aphra then hurled another explosive tooka at the creature , but failed to kill it , instead trapping herself and Tolvan in a part of the lab where the god could not reach them . While the creature tried to reach the trapped pair it incapacitated Bog , leaving him draped across a low wall in the laboratory . When the harm that had befallen the cyborg was pointed out to Posla by the pair ' s teammate Sister Six , Posla became enraged and leapt into action , launching several missile s at the beast . The attack abruptly halted though , once Bog recovered and revealed that he had in fact only been slightly winded . Death of a god . The pair reunited in cover , where they held each other for comfort . The final member of the mercenary team , the droideka Dek - Nil , then fired a single shot into the roof of the laboratory , causing it to collapse and killed both the god and the remaining stormtroopers . Aphra emerged and ordered the team to start looting , which they did , only stopping briefly when they heard the sound of Aphra shooting Go in order to save Tolvan . Unaware that Aphra had fired upon their teammate , Bog and the others then returned to their shuttle with the loot they had managed to recover . Onboard the starship , Aphra then informed the team that they had been tasked with a near - suicidal mission : attacking the Imperial archive known as Hivebase - 1 . It was the R & D headquarters for the Tarkin Initiative . Capturing Hera Syndulla . Aphra planned to get into Hivebase - 1 by offering something valuable to the trade with the Imperial officer s . So Aphra , Bog and the others went to the rebel flight school , a re - purposed Lucrehulk - class battleship that trained Rebel pilot s . They found the ship thanks to the files from the facility on Skako Minor . When they got there Glahst slipped away and a Rebel officer greeted them thinking they were new recruits . But when General Hera Syndulla arrived , Poslo made it clear they weren ' t signing up and told Syndulla they had a proposal . Realizing they were mercenaries , Syndulla had them arrested and put into cells . Whilst they were in their cells , Glahst returned and jumped into Dek and Aphra ' s cell . Aphra was relieved at first but quickly discovered it was Magna Tolvan . Tolvan had skinned the poor Defel and used her skin as a disguise . Tolvan drew her gun but didn ' t realize that Dek was aware of her . Dek stunned Tolvan and she shot once reflexively with her blaster disabling the shields keeping them in the cell . The alarms went off but the mercenaries did not flee as it would anger the rebels more . Syndulla noticed this and offered to let them leave . Aphra was still on for their proposal so Syndulla let them speak . Aphra explained that they knew how to get into Hivebase - 1 and that they needed Syndulla ' s help . Syndulla was curious to know their plan but as Posla was about to explain , Bog opened his compartment and shot out several blasters . Sister Six caught them and started stunning the rebels . In a matter of seconds all the rebels in the room , including Syndulla , were unconscious . Posla had not been told of this plan and was furious , despite Bog ' s attempts explain why they didn ' t tell him . They almost left Posla behind as they escaped with Syndulla . Infiltrating Hivebase - 1 . Once they were away from the flight school , Aphra contacted one of the Imperial officer s in Hivebase - 1 offering a trade with Syndulla . The officer accepted the offer and the crew began travelling to Hivebase - 1 . In the meantime , Bog let Aphra fix some of his diagnostics which had been affected their mission to Skako Minor . What Bog didn ' t know was that Aphra had programmed a contingency plan into Bog in case of an emergency which could be activated from the former head set of Rexa Go . The crew jumped into range of Hivebase - 1 , where they were soon followed by the Rebel flight school . Aphra had planned to lure the Lucrehulk - class battleship there using the tracking device on Syndulla ' s General plaque . The flight school found itself under attack by acidic creatures which began to breach it ' s hull . During the chaos of it ' s arrival , Aphra ' s team got into Hivebase - 1 where they investigated the collection of rejected prototypes and plans which were frozen to keep under control . During their search , Magna Tolvan got onto the bridge of the flight school and took out the Captain and bridge crew . Tolven then contacted Hivebase - 1 command and notified them of the presence of Aphra ' s crew . Aphra and her crew realized this and the frozen prototypes started to defrost around them . Before they could react , Dek was gunned down and they were pinned behind crates . Aphra asked Posla to fend off the cyborgs with his built in rocket launchers , but the man refused saying it was against his moral code . That was when Aphra activated the contingency in Bog ' s system and Bog walked into the firing line of the cyborgs , killing him instantly . Posla watched his soulmate fall to the ground and , in a fit of rage , advanced to fire upon the wave of forgotten designs . Personality and traits . Whatever skin Bog had left after his cybernetic reconstruction was fair in color . He entered into a same - sex relationship with the mercenary Tam Posla , and upon meeting Aphra warned her not to disturb his lover as he was listening to what Bog referred to as " his happy tunes " . While on Skako Minor , Bog informed Posla of Aphra ' s criminal history . Bog and Posla became bounty hunters in order to raise funds to take down Dr . Cornelius Evazan , the man who had turned Bog into a cyborg . Bog refused to kill a fleeing stormtrooper despite orders from Rexa Go , since he was not being paid per kill he made on the mission and the Imperial had broken no law . He and Posla also refused to fight against the chthonic worm god that they encountered in Tambor ' s laboratory , as it was not covered in their contract . When Sister Six declared that Posla and Bog were crazy while they hid from the god , Bog chastised her and claimed that knowing what mattered the most was more important than sanity . Equipment . Following his cybernetic reconstruction , Bog lacked a head , instead having orange and white cybernetics built around his neck . His legs and lower abdomen were also replaced with cybernetics , which left a portion of his guts exposed around his waist . Bog carried a blaster while on Jedha , and had a bayonet attached to the weapon while on Skako Minor . Behind the scenes . Caysin Bog first appeared in the film " " , debuting in the first teaser trailer , which was released on April 7 , 2016 . The trailer scene featuring Bog was not used in the final release of the film , although he can still briefly be seen during the Jedha City ambush . The character was not named in the film but received identification in " " , a reference book written by Pablo Hidalgo and released on the same day as the film , December 16 , 2016 .