Naruto Episode 54: The Summoning Jutsu: Wisdom of the Toad Sage!
Episode 54 of 220 of Naruto, aired October 15, 2003, 25 minutes. Available with English subtitles and dub where released.
Episode summary
While Jiraiya attempts to teach Naruto the Summoning Jutsu, while doing research as well, Dosu learns the hard way why Gaara is so dangerous. Meanwhile, Baki and Kabuto secretly meet and reveal a sinister plot against Konoha. When Hayate discovers this dark secret, he attempts to warn the Hokage. However, he'll have to get through Baki first!