Phineas Flynn was a Force-sensitive human male who lived on the desert planet Tatooine. He worked as a moisture farmer with his stepbrother Ferb Fletcher.
On Tatooine, they are young moisture farmers that were having the time of their lives. They stop by their neighbor, Luke Skywalker, and impress him with the modifications they made to their speeder using the power converters they picked up at Tosche Station. Phineas offers to trick out Luke's moisture farm, but Luke says that Uncle Owen prefers to do things the old-fashioned way.
Phineas and Ferb return home for lunch. Their mother, Linda, looks at their list of things to do. Phineas' stepfather, Lawrence, proposes that they go to summer camp on Naboo and Linda suggests they go to ski camp on ice planet Hoth, but Phineas passes, insisting that neither he nor Ferb have ambitions to leave Tatooine. He and Ferb take off after finishing their lunch.
Phineas and Ferb return home after giving a bantha a shower but accidentally bump into R2 and (unknowingly) knocks Perry side of a cliff. They see the part of the message Leia recorded to Obi-Wan Kenobi, and assume she means Ben Kenobi. Phineas explains they were just at Ben Kenobi's house not too long ago as he gives them "Jedi lessons" and decide to return R2 to him, offering the droid a ride. R2 then says he would rather go out on his own, which he soon does. Suddenly, after Agent P climbs up and falls off a cliff after Phineas and Ferb take off and accidentally ruins a young Tusken Raider's birthday party. It is then shown that the disc containing the Death Star plans was accidentally left in the backseat of Phineas and Ferb's speeder.
Phineas and Ferb leave their home for another task, but they then discover the disc in the backseat. Ferb tells his brother that R2-D2 is on his way to Mos Eisley with Luke and Obi-Wan.
At Mos Eisley, Phineas and Ferb's speeder follows Luke's speeder and searches for them. They visit their Toydarian friend, Blatto, who plays the disc in the head of another R2 unit. They discover that the Death Star is designed to destroy planets, but that it has one weakness, a small exhaust port that, if it comes into contact with a proton torpedo, will function as a self-destruct.
Phineas then determines that if the Rebel Alliance had this disc, a one-man fighter ship could go into that port. Phineas and Ferb decides to return the disc to R2. Baljeet then sees Phineas and Ferb with the Death Star plans. Candace goes into busting mode and chases them. Phineas and Ferb try to reach R2, but it left with pilot Han Solo and Chewbacca in the Millennium Falcon when the Stormtroopers attack. Phineas and Ferb decide to go into the cantina to find a pilot to deliver the Death Star plans.
In the cantina, Phineas asks the bartender where they can find a pilot, and he points to a girl named Isabella sitting alone at a table in the corner. During this, a female Twi'lek named Vanessa is singing a bluesy song about how "so low" she feels. Phineas introduces himself and his brother to Isabella. Phineas explains to her they need to find a ship that took off from Docking Bay 94. Isabella identifies the ship as the Millennium Falcon, the ship belonging to Han Solo, with whom she has a rivalry with ever since the Falcon cut off her own ship, the Centennial Chihuahua, during the Kessel Run when she was extremely close to finishing the run in eleven parsecs. Overcome with bitterness on the topic, she shoots Vanessa's microphone after hearing the her sing the words "so low" several times. The trio head off to her ship, but Candace discovers them and tries to shoot at them. Of course, Baljeet and Buford miss, and the three of them barely escape alive as Phineas, Ferb, and Isabella just manage to head into the ship and speed away. On the ship, Isabella warps into lightspeed, causing the two unprepared boys to crash into the windshield.
With the ship in hyperspace, Isabella turns to hear tinkering behind her. She angrily asks what they are doing, and strictly tells them not to touch her ship. Phineas begins to wonder about his family and mentions making new friends, but Isabella refuses this friendship. Nonetheless, he still asks Ferb whether or not "a girl like her and a guy like [himself]" would work out together. They finally catch up to the Falcon when they are not far from something that looks like a small moon, but Phineas recognizes the "moon" as the Death Star. The Death Star catches both ships in a tractor beam pulling them along with the Falcon. Isabella readies to shoot the ship free with the ship's lasers, but Phineas and Ferb offer an alternative to fighting.
Phineas and Ferb make some modifications to the Chihuahua to disguise it as a donut truck, including making it smell like one. Isabella contacts Imperial Officer Jeff to disengage the tractor beam on them and docks at Bay 427.
Phineas, Ferb and Isabella sneak away from the disguised Chihuahua to find R2-D2. Ferb then feels a presence in the Force. This presence turns out to be Perry, who is happy to be reunited with his old friends. Phineas introduces Perry to Isabella and explains to her that Perry the Platypus used to be their pet, but they disowned him after finding out he was secretly an agent with the Rebel Alliance, feeling as though he betrayed their trust, but now things have patched up. Perry goes back to his mission. Phineas, Ferb and Isabella do the same.
Moments later, Ferb feels that Perry is in trouble and decides to separate from the other two to help him. Phineas and Isabella then cross Candace's path, recognizing them as the Rebel sympathizers from earlier and further angered when Isabella shoots the console in an attempt to distract her ("That's coming out of my salary!"), she chases them across the battle station. Candace continues to chase Isabella and Phineas but slips on some disposal liquid left from the garbage chute and hangs from a ledge. Phineas decides to save her, much to the annoyance of Isabella. Phineas catches Candace, but she is confused as to why, since she always believed that the Rebel Alliance were the enemies, Phineas and Isabella catch up with and see R2-D2 and the others leave on the Falcon. Isabella tells they should leave immediately or they will lose the Falcon, but Phineas won't leave without Ferb. Phineas decides to trust Isabella to deliver the disc to R2-D2 despite Isabella warning him that she's not coming back. As Phineas explores the station in search of Ferb, he sees a room dousing with a red light. The red light is emitting from a modified Sith-inator. Phineas discovers it was built by Ferb, who is transformed by the Sith-inator, now wearing a Sith uniform and has Darth Maul-esque face makeup on.
Elsewhere, Darth Ferb reveals to his brother that he modified the Sith-inator to create an army of Sith warriors. Darth Ferb offers his brother to join the Dark Side. Phineas then laughs at this, believing Darth Ferb was joking him. Darth Ferb proves that he is serious by getting out his lightsaber. Phineas refuses to fight his own brother, so Darth Ferb decides to obliterate him. With no other option, Phineas was forced to fight his now evil stepbrother, but Darth Ferb reveals a second lightsaber blade and continues the battle.
After they spar further, he activates even more blades. Phineas decides to hold off the fight so he can modify his own lightsaber. Phineas and Darth Ferb finally finish modifying their lightsabers and the fight continues. Their multi-lightsabers now also have motors to make them spin around. Their fight is interrupted by Perry and Darthenshmirtz crashing down into their area. Darthenshmirtz declares victory, but accidentally steps into his own carbonite trap. Perry attempts to help Phineas, but Darth Ferb stops him by using the Force, and also destroys Phineas' lightsaber then activates the Sith-inator to make Phineas join him in the Dark Side.
Suddenly, a laser blast hits Darth Ferb. The blast came from Candace, who came in to help. But Phineas tells her not to shoot Ferb since he is still his brother. Darth Ferb then attacks Candace and cuts her blaster. Phineas attempts to reach the inator, but Darth Ferb stops him from doing so. Candace decides to attack Darth Ferb by putting some pieces of broken Carbonite in the socks she got for Vader and throwing them at him.
With Darth Ferb distracted, Phineas throws his broken lightsaber into the inator's self-destruct port, and the inator is destroyed. Phineas, Candace and Perry look for Ferb under the rubble. After he gets out, he is himself again and Phineas embraces his brother.
Candace tells the gang they need to get off the Death Star and leads them to the bus pod station. Phineas and Ferb sees Luke and his X-Wing fighter fighting followed by Darth Vader's fighter to the port exhausted port and realizes they should leave before Luke fires at the exhaust port. As soon as they reach the station, the last bus pod leaves. Believing this to be their end, each of the group admit to some of their regrets. Phineas mentions that he was never reunited with his sister, who left the family behind on Tatooine when he was a baby. Suddenly, Candace recognizes the her brother that she abandoned years ago, and Phineas recognizes his long-lost sister. They embrace each other happily and then Candace asks about Ferb. Phineas explains that Ferb is their stepbrother from Linda's remarriage and begins to tell the story of what happened to Linda's first husband when the Death Star is finally destroyed. Fortunately, Phineas, Ferb, Candace, Baljeet, and Buford are all saved by Isabella on the Chihuahua, and Isabella finally accepts the Phineas' friendship. After the medal ceremony for Luke and Han, Phineas, Ferb, Perry and the rest throw a party, where Vanessa returns to sing . Candace, Buford, and Baljeet are now part of the Rebellion. Isabella asks Phineas if there is a chance they are related, and Phineas says no. Isabella says, "Good!" and gives him a kiss, causing Phineas to faint in a daze.
Phineas is skilled in inventing, construction, engineering, modification, and piloting machineries. He has great accuracy, being able to precisely throw his broken lightsaber on the destruction port of the Sith-inator.
He is proficient in lightsaber combat, demonstrating a capability to hold his own against Ferb while the latter is in the Sith persona, though the former is unable to beat his brother, who proves himself more skilled in the art.
Phineas Flynn first appeared in Phineas and Ferb: Star Wars, a non-canon crossover special with the Disney Channel animated series Phineas and Ferb. The special premiered on July 26, 2014. The character traits and design of Phineas were based on those of his counterpart of the same name from Phineas and Ferb and was voiced by Vincent Martella. Phineas wear a similar robe to the one worn by Luke Skywalker in .