Here's when Boulder rolls again in Return of Boulder.
["Joe gets a Bite" starts playing]
Narrator: The next day, everyone was working harder than ever. Then when Rusty went to check on Boulder, he noticed something.
Rusty; Hey, I think I saw Boulder slightly move!
[we see the boulder slightly move]
Rusty's driver: Rusty, don't say that. I don't wanna go through that incident again!
[but the boulder then rolls down the hill!]
Rusty: Oh, no! Not again!
[Boulder then rolls down the line]
Narrator: Boulder is now on the loose! And soon it is now racing down the main line!
Rusty: Come on, after that Boulder! [he races away]
[we now view Boulder detroying everything in his way, as Rusty is following close behind]
Rusty: Oh man, this is worse than the last time!
The Narrator: Later, the others were unfamiliar or heard that Boulder has been on the loose. Until...
Tom Tucker: Good morning, I'm Tom Tucker,
Diana Simmons: And I'm Diane Simmons, chaose has struck when a giant Boulder that has been on a hill for a long time, after a Boulder incident is now on the loose.
Tom Tucker: We'll now go to Ollie Williams, with the heli report. Ollie?
[Cuts to Ollie]
Ollie Williams: IT'S ROLLING LIKE A BOWLING BALL!
[Cuts back to Tom and Diane]
Tom Tucker: Thanks, Ollie.
Sweetie Belle: Oh, no! Boulder's loose!
Scootaloo: Oh great, here we go again.
Apple Bloom: We have ta' warn everyone!
Sweetie Belle: I better get Button and Babs to help out too!
[It cuts to her doing so]
Babs Seed: That Boulder is runnin' loose again?!
Sweetie Belle: Yeah!
Button Mash: Then let's go and stop it before it's too late!
[they hop on their dragons and take off for the narrow gauge line]
[back with Boulder]
Narrator: Meanwhile, everyone in town was enjoying the day.
[we then see the Cabbage Man with his cabbage cart, and then he's starting to cross the track when he sees Boulder!]
Cabbage Man: WHOA!!! [jumps clear]
[then Boulder smashes his cart]
Cabbage Man: MY CABBAGES!!! (groans) Just for once, can I have one cameo appearance without my cabbages getting destroyed?!
Rusty: [races past] Sorry, Mr. Cabbage Man!
Narrator: Rusty continued his pursuit of Boulder, but then when he turned a corner Boulder was nowhere to be seen. Suddenly!
Rusty's driver: Oh no! It's behind us, again!
Rusty: Oh no!
[Rusty then races down the line with Boulder on his tail]