The Slime That Would Not Die (Monster Squad, No. 1)

Jesse Ranger was just an average kid with an obsession for Oswald Leery's B-Monster movies until he discovered a dangerous secret. It turns out Leery's special filming process brought his movie monsters to life and now they've escaped the screen! Something must be done, so Leery recruits Jesse, Stella, Damon, and Lindsey to help. But how do you trap a B-Monster, especially one made up of slime?