Blast the lock with a Cherry Bomb from the tree at the bottom right.
To get to the Third Spy
On Balding Avenue, use your grapple bowtie to go up the building to the right of the Grease Monkey garage. At the top, you can enter the "Rooftops". From there, you put on your Chameleon Suit and grapple left to the next building, which is guarded and has lasers to keep you from going up. Instead, go farther left to the red building, and climb that one. At the top, you can grapple right to get to the tower. Enter the tube to rescue the third spy from the Greenhouse.
To rescue the Third Spy
Take off the Grappling Bowtie. Go past the cage where the Spy is being held, and to the bottom right of the greenhouse. Find the Cherry Bomb tree and get a Cherry Bomb. You must act quickly because the bomb will explode in about 40 seconds. Push it left onto the Trampoline Plant, which will throw it up to the right. Avoid the carnivorous plants and climb up to where it landed. Push it left again, onto the second Trampoline Plant, which will throw it up and left, near the cage. Jump up and push it closer before it explodes.
The freed third spy gives you the Ultra Vision Goggles, which can see lasers. Once you have obtained the Fingerprint from the Bistro B.A.D. agent, you can enter the B.A.D. control station to the right of Toupee Terrace.
(see related question)
The 3rd spy is released by using the Cherry Bomb tree and the two Trampoline flowers that catapult objects into the air. Release a Cherry Bomb and push it onto the first plant, which will throw it up to the higher level. Jump up and push it to the left again onto the second plant below. This will catapult it onto the platform with the cage. Push it close and step back. You only have about 40 seconds to complete this process, which is complicated by the Flytrap plants trying to bite you. The 3rd spy gives you the Ultra Vision Goggles that see lasers.
(The Cherry Bomb Tree is at the lower right hand side.)
(see related question)
You take it to 1 of the cage to free the third spy.
The metal cage is too tough for the Laser Pen. You have to use the Cherry Bomb from the Cherry Bomb Tree at the lower right. (see related question)
Use the Cherry Bomb from the tree at the bottom right, which can blast open the cage. (for full solution, see related question)
In "Spy Island" at the end of the game to save the 3rd spy.
The third spy has it
Rescue the third spy by opening the cage in the greenhouse atop Balding Avenue. She will give you the Ultra Vision Glasses. (see the related question)
either in the building with all the Venus fly trap in the cage or in the building tied up in the in the attic
there is no key for the 3rd spy
There is no greenhouse on Spy Island.
Type your answer here... to get the spy out of the cage, you have to have a laser pen to cut through the bars.
Director D of course
The Cherry Bomb can blast open the cage if you get it close enough before it explodes. Take it to the cage using the springy "trampoline plants" (there are two). Push the bomb left onto the first one, then climb up to where it lands and push it left again onto the second one. Hurry to the cage to push it a bit closer and you can free the third and final spy.