Can anyone think of a crit mission (now Archived) that features a room full of hostile Agents? I'm thinking of using one for a player event sometime soon...
There's that mission in the third Pandora's Box set that has you go into a mission area with dozens of Agents. They're the standard lvl 50-51 3 chevron Machine NPC Agents, not the level 100 or 255 Agents.
Could try getting 6 level 50s on one team and do a normal mission until you get machine enemies, as more level 50s are on a team, the levels of the enemy increase and this may give you Agent enemies.
I'm pretty sure one of the missions in Merv 4.1 or 4.2 has Agents spawn on you after you test an EMCP. Ditto the one where they rescue Effy.