You can't open the door, but you can go over it.
go outside and play
Once you open the locked vault and rescue the agent, go back to the right and there will be an agent there.
click on the cherry bomb on the roof tops push it in front of the cage it will blow up and BAM you have the third agent
You get the laser glasses by rescuing the third agent. To rescue the third agent, go into the roof. There will be plants that have teeth. Watch Out! Find the Cherry Bomb Tree, and bring it over to the cage where the agent is. The Cherry Bomb will explode and the agent will give you the laser glasses.
There are three kidnapped spies to rescue, in order : the one at the Docks, the one atop the electrified building on Toupee Terrace, and the one in the rooftop greenhouse above Balding Avenue. (see the related questions for each)
To rescue the second agent in Poptropica's Spy land, you first go to toupee tarrace and go passed the door, on the window, jump to the ledge, on to the next window, up to the top of the roof, and laser the bars, and go inside to rescue Agent#2 and get a grappling bowtie.
The second rescued spy (in the electrified building on Toupee Terrace) gives you the grappling bowtie, which you use to rescue the third and final missing spy.
you fight bad hairless man
when you rescue the agent on the doc he give you a lazer pen.
there isn't a fourth agent.
Antagonist is a process or agent that works against another.
at a place in spy island that i do not know of.