Jerry Smith (304-X) is an alternative version of Jerry, he is also the husband of Beth Smith, the step-father of Summer Smith and Morty Smith, and the son-in-law of a Rick Sanchez, he married the woman after she and her children came to his dimension. He is even dumber than most other Jerries.
At some point, after Beth (35 years old) had brought her children, Summer (17 years old) and Morty (14 years old) to the Dimension 304-X, Morty was able to track down the Jerry of this dimension and have his mother marry him. This led them to fight a lot and rarely get along, though more from Beth than Jerry. After the Resistance is started and Summer joins them, Jerry is sent in to work as Morty and Beth's sleeper agent among the enemies.
Jerry serves as doorman at the Resistance base and gets his eyes poked in by Rick (C-132) when he and Morty are led there by Summer. Jerry is severally hated by all the rebels and after they leave him alone, he is contacted by Beth to be activated for a mission. He tried to flirt with her, but Beth shuts him down and tells him to retrieve Rick Sanchez and blow up the Resistance base.
He finds Morty (C-132) alone and uses Morty's belief that he is Morty (304-X)'s estranged father to get him to walk with him down the hall. Jerry takes Morty hostage with a laser gun and demands Rick to come with him to dictator Morty. Jerry accidentally shoots Morty. Rick, believing Jerry killed Morty, threatens to kill him with his own gun. Jerry pulls up a timer and and says he will kill them all first. He activates the timer and blows up the whole Resistance base.
Somehow he survived the explosion and reappears in a huge armoured vehicle just as Summer and dictator Morty is reconciling, but he accidentally runs them over and kills them.
This Jerry, is a dumber, clumsier version of Jerry than normal. He is stupid and barely able to follow orders, therefor placed as doorman at the base. Even though he is completely hated by everyone, he doesn't seem affected by it or even caring about it. He still has romantic feelings for Beth, even though she is constantly rejecting him. He does appear nervous when he is heading out to destroy the base, showing that he is not just foolish and non-caring. When he talks, he likes to use dumb phrases like "Catch you on the flippy floppy" and "Lates". His clumsiness is shown when he accidentally shoots Morty (C-132), and again when he accidentally kills his step-children, Summer and Morty.
He doesn't appear intelligent enough to manipulate his step-son Morty, and using false information that his step-daughter Summer has given Morty about their dimension's past, to take him hostage.