Jimmy first appears in Fame when Ben finds out that Jimmy has been posting things and has sent out a video about him and his aliens on a website that finally showed the world that Ben has the ability to turn into aliens, as he thought Ben would like the fame and money, but Ben ended up being both liked and hated by the public as a result. The team realize that Jimmy is pretty useful so they let him do what he wants.
In Andreas' Fault, Jimmy told Ben about the Forever Knights and where they can go to find the castle.
In Eye of the Beholder, Jimmy gave Ben "relationship advice" concerning his relationship with Julie.
In The Big Story, Jimmy was trying to get some footage of an alien ship but instead finds a plant alien trying to take over Earth. Jimmy was able defeat the plant and plant copies of Ben, Gwen and Kevin using peanuts which proved to be the plants only weakness.
In The Ultimate Enemy: Part 1, Jimmy and his mother were transformed into Esoterica. OmniverseEdit
Jimmy returns in Return to Forever, where he was first seen in his room watching a news report by Will Harangue. He pauses the video and notices two mysterious figures behind Harangue. He prints the image and goes straight to Harangue showing it to him. Jimmy wants to get the unedited version of the fight, but Will asks for money in return. Jimmy objects, which leads to Will threatening to call security on him.
Later, Jimmy starts questioning aliens in Undertown about the photo. However, the aliens all react in fear and act like they don't know anything. Unfortunately, he runs into Sir Morton who begins to chase him through Undertown. Ben and Rook notices that and save Jimmy from the Forever Knights.
Jimmy reveals that he is an expert at Alien Tech and he knows everything after viewing videos. Jimmy want to help Ben and Rook find the Forever Knights but they both disagree and lock him in the Proto-TRUK. However they were captured by the Forever Knights and unable to escape. Meanwhile, back at the Proto-TRUK, Jimmy is taking photos of himself.
Ben and Rook try to come up with a plan to escape until Jimmy comes crashing through the wall in the Proto-TRUK. He turns off the force field which trapped Ben and he heads over to free Rook as well. Not much later, Ben and Rook defeated the Forever Knights but Chadwick had already started the Pulse Generator. Hearing what he has done, Jimmy knocks him out by using a wrench. He tells Ben to transform into Grey Matter but Ben gets Jury Rigg instead. Thankfully, Jury Rigg was able to stop the Generator saving all the aliens in Undertown.
Jimmy appears in Cough It Up, when he records how Sunder wrecks a shop. Ben arrives to fight Sunder, which makes Jimmy excited. Before he could upload the battle to his blog, his cell phone's battery dies. Seeing this, he runs away. Ben gets saved by Spanner and Jimmy asks him if he is there for the bounty hunters. Ben tells him that he just wanted some socks. Jimmy notices Kraab and follows him to the Black Hole, where he is blocked by a Bouncer.
He somehow managed to get the information that the bounty hunters are after Argit and tells that to Ben and Rook. Rook wants to investigate but Ben ignores it. Jimmy runs away and as he ran Spanner appears and tells Ben the same thing. Hearing Spanner, Ben gets excited and goes to Argit.
Jimmy later helped Ben, Rook and Argit to hide from the hunters in an abandoned storage unit. Ben said he was hungry, so Jimmy said he would get him food. Interestingly, Spanner appears (as Jimmy leaves) and brings food. Rook notices that Jimmy and Spanner have never been seen at the same time. Ben, Rook and Argit get attacked by the Sotoraggian trio and they manage to take Argit with them. As Spanner flies out of the storage, Jimmy looks into the storage from above. After this, Ben agrees with Rook that Jimmy might be Spanner.
Ben, Rook and Jimmy arrive at the Black Hole and Ben tells Jimmy to stay outside. Jimmy wasn't seen until Spanner got blasted off by Sunder and he fell back. Ben gets really annoyed and Jimmy runs out the bar. Spanner immediately returns which makes Ben even more annoyed, saying that he isn't fooling anyone.
After the hunters got banned from Undertown, Jimmy appears and says that he knew that Ben would be able to pull it off. Ben and Rook stare at Jimmy and ask if he has anything to say. He tells them that he wasn't waiting outside the bar and he was hiding above the ceiling all the time. Rook scans him but he couldn't detect the troopship. Ben wants answers but Jimmy goes to Argit to get an interview with him.
In Fight at the Museum, Jimmy attends the alien artifacts exhibit at the museum. When Subdora steals the Orb of Pooma Poonkoo, Ben tells him to get security to lock down all the exits. After doing so, Jimmy walks in on Ben fighting Subdora. Ben, still believing Jimmy is Spanner, tells him to help, to Jimmy's confusion. Spanner then appears, proving that he and Jimmy are not the same person.