Sequel Squad Membership

 is a limited-time premium consumable released for the Superheroes 2016 Event. It increases the amount of currencies received from tapping Criminals in friends' towns. Once purchased, its benefits last until the end of the event.

Trivia

 * Doubling the rewards from neighbors' town, the player could get a maximum of 220 Brass Knuckles, Soilant Red, or Crab Juice Cans (instead of the usual 110) per day and 120, 180, or 240 Trading Cards (instead of the usual 60, 90, or 120) per day.
 * For 14 days, the duration of Issue 1, it meant an addition of 1540 Brass Knuckles and 840 Trading Cards.
 * For 14 days, the duration of Issue 2, it meant an addition of 1540 Soilant Red and 1260 Trading Cards.
 * For 14 days, the duration of Issue 3, it meant an addition of 1540 Crab Juice Cans and 1680 Trading Cards.
 * This adds to a maximum of 4620 additional event currency and 3780 additional Trading Cards that could have been obtained with the membership.