If you are talking about the turtle from Dragon Ball, (when Goku is a kid) it happens around Episode 5, if I'm right. If you're talking about "Turles," not "Turtle" or "turtles," in the Dragon Ball Z movie "The Tree of Might." He does not appear in the main series.
Goku never meets Bardock.
131
in dragonball episode 6 or 7
Season 4
cell saga...meet me in the ring episode 153.
Goku never meets Bardock.
131
in dragonball episode 6 or 7
Goku and Goku Jr. meet in the DragonBall GT movie, "A Hero's Legacy."
Season 4
Ep. 7
The first episode
cell saga...meet me in the ring episode 153.
137 dragon ball prelimanary peril
episode 8 of Dragon Ball
goku met krillin in the original dragon ball series where they went to train under master roshi krillin hated goku, but after a while they became best friends and in case u are wondering his best friend is krillin.
Goku turns SS4 in Episode #35 gt.