S1, E2: As the supervillain breakout keeps the Avengers busy, a fourth supervillain prison is revealed housing the ultra-powerful Gravitron. Now he's free too, and after Nick Fury.

S1, E2: As the supervillain breakout keeps the Avengers busy, a fourth supervillain prison is revealed housing the ultra-powerful Gravitron. Now he's free too, and after Nick Fury.