Guldo's History
Background
Like the other members of the Ginyu Force, Guldo's special powers originated during his childhood. He realized he had psychic powers as a child, and caused mischief like lifting up girls' skirts and stealing whatever toys he wanted.
At some point Guldo became a part of the Galactic Frieza Army. Guldo was the last member to join the Ginyu Force, in his membership test he had to fight against Burter, Jeice, Recoome, and Ginyu to see if he was worthy to join. He fought alongside a partner (as new recruits were allowed one helper) and managed to prove his worth, thus being given membership.
After he became a member of the Ginyu Force, it is shown in an anime only flashback Guldo has, that he has heavy loathing of Vegeta after the Saiyan Prince insulted him by saying that he suffers from bad breath (Vegeta says he does not understand why Frieza put a "four eyes frog face" like him on the Ginyu Force in the Ocean dub, and Vegeta calls him a "four eyed freak" in the Funimation dub). Guldo was about to strike when Frieza interfered, asking Vegeta to help him conquer a planet and disgracing Guldo's judgment. This causes Guldo to hold a grudge against Vegeta.
In Dragon Ball: Raging Blast 2, it is revealed that Guldo is not against joining Cooler's Armored Squadron as he says "If I do well, this could be my chance to join the Armored Squad..." in his pre-match dialog when facing Cooler.
At least a year before they went to Namek, Guldo was invited to join the Ginyu Fitness Club, but he declined and decided to go on a Chili Burger diet. This decision would come back to haunt him later as it proved to cost him stamina.
Frieza Saga
Upon their arrival on Namek under Frieza's orders, Guldo and the other members of the Ginyu Force find Vegeta, Krillin and Gohan trying to make a wish with the Dragon Balls, however, when Vegeta tries to throw one away, Burter shows his remarkable speed by catching it. Vegeta then orders Krillin to destroy the Dragon Ball he was holding, Krillin tries to do so but Guldo intervenes by stopping time and taking the ball out of his hands.They then play a game of Rock-Paper-Scissors in order to decide who gets to fight Vegeta and who gets stuck with the "trash," Gohan, and Krillin. Recoome wins outright, and Guldo, as the runner-up, fights Gohan and Krillin, much to his displeasure. However, their speed and strength catches Guldo off guard, forcing him to resort to sneak attacks and time-freezing. Every time Guldo tries to use the Time Freeze technique, Gohan and Krillin are too close for comfort, which makes Guldo resort to running away every time, usually running out of breath even faster, due to his bad health. Finally, after realizing using the Time Freeze technique is going to get him nowhere, he now prepares to use the full extent of his psychic powers. Using his mental capabilities, Guldo reverts to his mind freeze technique in order to physically paralyze their bodies, rendering them helpless.
Now laughing instead of running, Guldo uses his telekinetic abilities to lift a tree, as he prepares to throw the sharp trunk straight towards Krillin, which will impale him. As he prepares to finish them off, however, Vegeta unexpectedly steps in and saves them by brutally cutting off Guldo's head (Vegeta does this with a sideways chop in the manga, while he uses a ki blast in the anime). Guldo's severed head rolls on the ground and lives long enough to curse Vegeta for interfering, complaining that what Vegeta did was cheap, and unfair. Afterwards, the Saiyan Prince disintegrates his head with another blast (in the Ocean dub, his decapitation is edited out; merely depicted as Guldo collapsing to the ground, his head still attached to his neck. His whole body is caught in the explosion, but, as was the case with Recoome, apparently still intact, the same as Dende when Frieza killed him).
Later, in an anime-only arc, Guldo goes to King Kai's Planet with Recoome, Jeice and Burter. There, he attacks Chiaotzu. The dead Z Fighters first thought that the Ginyu Force were too strong for them, as they heard from King Kai that even Vegeta was defeated by them. After Tien Shinhan defeats Burter and Jeice, and Yamcha defeats Recoome, Chiaotzu overcomes his fear of the smelly deceased fighter and does so as well by blasting Guldo away in the Bloody Pond. During the battle, Chiaotzu was constantly mocking Guldo about his bad breath.
Majin Buu Saga
Later in filler scenes, Guldo appears along with the other Ginyu Force members, Frieza, Super Cell, and King Cold. They were torturing some ogres for information in order to obtain a means out of Hell. Goku still defeats him and the other members of the Ginyu Force with one blow each; In the case of Guldo, an elbow to the head. After Guldo fell into the Bloody Pond with Recoome, Burter, Jeice, and Cell, Pikkon threw them out with a tornado attack, impaling them on a mountain of needles. They were then locked up in a prison cell along with Frieza and King Cold. Later on, Guldo is also seen in Hell while watching the battle between Kid Buu and Goku amongst many villains.
Dragon Ball Super
When Goku and Krillin were sent into a forest to retrieve a special herb for Master Roshi, an illusion of Guldo and many other villains from the Z-Fighters' past show up to challenge the duo.
