First Appearance: Sentinels of the Multiverse: Shattered Timelines
Where it is: It’s a high-tech prison
Primary Damage Type: Melee
Secondary Damage Type: Projectile, Fire, Toxic, and Lightning
Deck Concept: The Block forgoes dealing direct damage to heroes and villains like other environments and opts to create a secondary battle between two factions in the environment, agents and inmates. Heroes and villains get caught in the crossfire.
Biggest Global Effect: Defensive Displacement: Reduce all damage by 2. At the start of the environment turn, if there are no inmates in play, destroy this card.
Worst Card (for the Heroes): Prison Riot: When this card enters play, reveal cards from the top of the environment deck until (H)—where H is equal to the number of heroes—minus 1 inmates are revealed. Put them into play. Discard the other revealed cards. At the end of the environment turn, destroy this card.

Odd Ways to Win (Achievement Time):
Char (14HP): At the start of the environment turn, this card deals each non-inmate target 2 fire damage and 2 toxic damage.
F.I.L.T.E.R. Officer (9HP): At the end of the environment turn, this card deals the non-agent target with the second lowest HP (H) minus 1 projectile damage.
Block Guard (7HP): At the end of the environment turn, this card deals the non-agent target with the lowest HP (H) minus 2 lightning damage. A target dealt damage this way cannot deal damage until the start of the environment turn.
Time-Crazed Prisoner (4HP): At the start of the environment turn, this card deals the non-inmate target with the second highest HP X melee damage, where X = the number of cards in the environment trash.
How to Escape:
Inmates tend to deal more damage to heroes than agents, although agents can damage heroes too, so you’ll want to manage the number of inmates in play. Defensive Displacement makes this difficult, but imagine if you draw into Defensive Displacement (reduces all damage unless you have no inmates) with several inmates already in play. You might as well forfeit the game.

Prison Riot further complicates matters, but Warden Hoefle can manage these inmates. You’ll want to keep the Warden in the game as long as you can. I also don’t care for the Block Guard, another agent card. He not only can deal you damage, he can prevent you from dealing damage.