While The Book of Boba Fettseason 1 finale featured numerous instances of fanservice, it missed an opportunity for a hilarious moment between R2-D2 and R5-D4. A minor droid character from A New Hope, R5-D4 was nearly purchased by Owen Lars instead of R2-D2, but he malfunctioned due to a bad motivator, leading to R2-D2 being chosen instead and ensuring the completion of Leia Organa’s mission. The two astromech droids’ interactions were delved into in-depth via canon non-movie material, and The Book of Boba Fett should have had the two acknowledge each other at the end of its first season.
R5 astromech droids were notorious for being prone to errors and other functionality issues, though R5-D4 was a hard-working unit, albeit with low confidence. According to the Legends-era Star Wars radio drama, R2-D2, hoping to be sold by his Jawa captors so that he could continue his mission for Leia, sabotaged R5’s motivator, leading it to malfunction and R2 to reunite with C-3PO. According to Legends lore, R5 was stolen and repaired before the Jawas were massacred by Imperial Stormtroopers, and the droid eventually joined the Rebel Alliance as a spy, serving them faithfully and efficiently.
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The canon version of R5-D4 retains much of his Legends-era history, including his survival of the Imperial forces in A New Hope and service in the Rebel Alliance afterward. One major difference is that R2 didn’t properly sabotage him, so R5 blew his own motivator to assist R2 and thus the Rebellion, as revealed in From a Certain Point of View. As shown in The Mandalorian, R5 served Peli Motto after the Empire fell, and his dome retained scorch marks from his blown
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