Isotope-8

Isotope-8 is a rare element from Spider-Man's dimension that the Sinister Six wants to harvest for their own evil and unknown purposes. It first appeared in another Marvel video game, Avengers Alliance. In that dimension, it also originated from Earth but was noticed when some of it from space came to that Earth via a pulse.

What it can do and how it can be received
Also known as Iso-8 (singular) or Iso-8's (plural), Isotope-8 has many uses in the game. Iso-8 can be used to rank up Spider-Men. The number varies on how rare the Spider-Men are. Iso-8 can also be used as continues if the player fails an event, mission, or Unlimited run. The first continue requires one Iso-8, the second requires 2, the third needs 4 Iso-8s, and the fourth/final continue costs 8 Iso-8's. Some items in the shop can be bought through Iso-8. Another way to use Iso-8 is to speed up a Spidey Ops mission (the number of Iso-8's depends on the length of the mission. Iso-8's can also be used to buy some portals. The premium portal costs 25 Iso-8's and the VIP portal used to cost 100 Iso-8's but now costs 75 Iso-8's. On a rare occasion, a Hypercharged portal which costs 10 Iso-8's can get the player uncommon Spider-Men who have all 4 stars and are set at level 30 from the start. In the shop the player can buy a replenesh of 5 Spidey energies for 3 Iso-8's, a 25% score multiplier (for one run) for 7 Iso-8's, an extra 3 Vials per enemy (for one run) for 3 Iso-8's, and 2x combos for 3 minutes, which lasts 3 more seconds than normal for 5 Iso-8's.15% more Vials in every run costs 75 Iso-8s, and 15& more XP in every run costs 75 Iso-8's as well. After completing Issue 2, more slots for a tag team increase in Iso-8 cost, 3 costing 75 Iso-8 and 4 slots costing 100 Iso-8.

Iso-8 can be obtained by defeating gold enemies (1 per enemy), completing missions, ranking in Unlimited modes; daily challenges (winning the gold gets the player 3); or events, or buying them with real money. 10 Iso-8's cost $1.99, 26 cost $4.99 (5% more than the 10 for 2 deal), 55 cost $9.99 (10% more), 130 cost $20.00 (30% more), 350 costs $49.99 (40% more), and 750 Iso-8s cost $99.99, which is 50% more. A way to get 5 Iso-8's is to invite friends from Facebook. Sometimes there is a Flash Sale where some of the Iso-8 which costs real money gives the player more Iso-8. For example, in a Flash Sale, $20.00 could get the player 260 Iso-8 rather than 130.