<Tr> <Td_colspan="3"> While gathering supplies in the Grey Terminal, Sabo, Luffy and Ace are captured by Bluejam's crew . Sabo's father scolds Ace and Luffy for their involvement with his son and takes him back to High Town . Bluejam takes Luffy and Ace to his hideout and forces the two to take supplies to the Grey Terminal . Meanwhile, at High Town, Sabo finds out about the nobles' plan to burn down Gray Terminal from his newly adopted brother Stelly . He also tells Sabo that a group of observers from the World Government will arrive in Goa Kingdom in three days time . Sabo runs away to warn Luffy and Ace . The next day, the nobleman has his family search for Sabo . Sabo is told to keep the arson plan a secret, but runs back to Luffy and Ace . </Td> </Tr> <Tr> <Th> 501 </Th> <Td> "The Fire Has Been Set! The Gray Terminal in Crisis!" "Hanatareta Honō - Gurei Tāminaru no Kiki" (放 たれ た 炎 グレイ ・ ターミナル の 危機) </Td> <Td> June 5, 2011 </Td> </Tr> <Tr> <Td_colspan="3"> In High Town, Sabo fails to warn his brothers as he gets caught by his father . Meanwhile, Bluejam tells Ace and Luffy about the fire at the Gray Terminal . Sabo is detained in a wine cellar, after escaping once again he fails to reach the Gray Terminal . At which point he tells Dragon about the fire and admits that he will never be free as long as he stays in High Town . Bluejam and his crew burn down the Grey Terminal, trapping the people in Goa Kingdom and filling the Dadan family with horror . Bluejam discovers that he was cheated by the Nobles, and confronts Luffy and Ace about his hidden treasure . Ace uses his Haki to knock Bluejam's crew out, but Bluejam threatens to kill Ace with his gun . </Td> </Tr> <Tr> <Th> 502 </Th> <Td> "Where can freedom be found? A Sad Departure of a Boy!" "Jiyū wa Doko ni Aru? Shōnen no Kanashiki Funade" (自由 は どこに ある? 少年 の 悲しき 船出) </Td> <Td> June 12, 2011 </Td> </Tr>

What episode do we meet ace in one piece