Of course these are both from the original Team Fortress. All the old classes make a return in Q3F with new names. Engineer Has the ability to create Autosentries. The slowest, toughest, and most powerful class. Packs a minigun and heavy armor.
Agent Can disguise as one of the other team or vanish in a puff of hallucinogenic gas.
Armed with a dartgun, shotgun, combat knife and grenades. Grenadier Packs a grenade launcher, a pipe laucher, shotgun, explosive charge, cluster grenades and hand grenades. The all-round, rocket launching class. Your basic GI Joe. The final version will sport new Rocket Launcher and character models.