DB Chapter 379
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
"Cell's Last Chance" (絶たれた！？セルの完全体, Tatareta!? Seru no Kanzentai; Literally meaning "Interrupted?! Cell's Perfect Form") is chapter 379 of the Dragon Ball manga.
Cell wonders about this Super Vegeta business, and Vegeta says it'd be hard to explain it all. He says Cell should be more worried about himself, since it looks hopeless for him. Kuririn, still floating over the island, says Cell's changed since before. He is bitter that Cell has already reached his perfect form, and they went through the trouble of making this controller for nothing. Enraged, Cell swats his tail at Vegeta, but Vegeta jumps over it and kicks Cell. Then he kicks Cell in the stomach, and knocks Cell down into the water. Kuririn can't believe Vegeta's power, and then spots Trunks on the island, saying he's gotten strong too. And then he spots the two artificial humans, and figures Cell, Vegeta, and Trunks haven't noticed them. Kuririn looks hard at the controller, remembering what Bulma said about being within ten meters, so he stealthily lands on the island.
Kuririn nervously sneaks toward them, realizing that Cell hasn't reached his perfect form yet. But No. 17 is gone, so he must've been absorbed. Cell climbs out of the water, and Vegeta decides to tell Cell something even more shocking. "That Trunks guy over there... His true strength is nearly up to my level!" Cell looks over at Trunks, and starts to look nervous. But Vegeta is annoyed that Cell wasn't so incredible after all, and there's almost no need to kill him. Cell then starts screaming: "DAMN IT!!!! If I could only reach my perfect form...!!! Then he'd be nothing to me." Vegeta looks a bit intrigued, as Kuririn approaches the Artificial Humans.