Catalyst

Catalyst is a second mission of helping Ryder. It appears after Home Invasion.

Plot
The mission begins with CJ going to Ryder, who made his own water after couldn't find it in his backyard. Just then, Tenpenny and his accomplices came to tell the two that there is a train that had weapons.

Ryder and CJ went to the train to find the Vagos rying to steal the train first. After the Vagos were fallen dead, the Ballas came to get the train. After protecting the train, CJ throws boxes at Ryder. After aquiring the boxes, the two were pursued by the police, only the two manages to escape and goes to Ryder's house.