Up The Down Steroid is the name of the episode... called so because jimmy takes steroids and he is handicapped (he doesn't have Down syndrome, it's just a figure of speech referring to handicapped people as "down"
Episode 130 is when she officially joins
she is on the SHOW throughout the first and second season, but she joins glee club in the episode special education
In the first episode of season three (3x01 - The Purple Piano Project).
Season 4, Cartman Joins NAMBLA
Jess joins Gilmore Girls in the second season episode "Nick & Nora/Sid & Nancy."
Episode 130 is when she officially joins
she is on the SHOW throughout the first and second season, but she joins glee club in the episode special education
233 and joins the crew in episode 322 after Robin forces him to by grabbing his nuts
he joins the Olympic torch
Sai joins team 7 in Naruto shippunden episode 34
Sasuke joins Orochimaru in the end of episode 109 but everyone(except Sakura) finds out in episode 110
In the first episode of season three (3x01 - The Purple Piano Project).
Shippuden 212-213
Season 4, Cartman Joins NAMBLA
Jess joins Gilmore Girls in the second season episode "Nick & Nora/Sid & Nancy."
He joins them on episode 7.
Yes, she joins the team in the 25th episode "Usual Suspects".