Catalyst

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

Plot

The mission begins with CJ going to visit Ryder, who is making his own "Water" after he couldn't find it in his backyard. Whle Carl and Ryder are talking,, Officer Tenpenny and his accomplices drop by to inform the two that there will be a army munitions train passing through town shortly, and that enemy gangs such as the Ballas and Vargos will try to raid the train.

Ryder and Carl immediatly depart, arriving at the train only to find the Los Santos Vagos have ambushed the train first and are attempting to offload munitions. After the Vagos are killed by Carl and Ryder, the Ballas show up and try to kill Carl and claim the train. After protecting the train from the Ballas, the train starts up, gradually leaving the area of the ambush. Not wanting to lose the munitions, Carl jumps on the train, throwing crates at Ryder, who is following behind the train in his Picador. After aquiring sufficant munitions, the two are pursued by the police, but manage to escape and make it back to Ryder's house in Grove Street.