Ratman is hiding in the Sewer Control Room below City park. Enter the sewer through either of the restrooms. Go left and turn the red control wheel to lower the water. Another red wheel will appear on your right to raise the water again. Swim to the control room door.
(see related question)
Ratman is on Super Power Island. There is a large rat in the sewer entrance to the factory on 24 Carrot Island (climb up into the bypass pipe to elude him).
(1) It's right by where Sir Rebral is and you can find ratman in the bathrooms and if you mean't sewer it is in the subway and speeding spike is there.
In the sewers on Super Power Island, Ratman is guarded by rats and stinging flies. When you find him, go right and jump the rats to reach the final red wheel at upper right. This dumps sludge on Ratman and the flies. Now they will chase and sting you. Go far right, then run back left and quickly climb the BIG pipe in the middle, from which you can jump to Ratman. The flies are always right behind you.
There is no jetpack on Super Power Island, as there is on Early Poptropica. The ability to fly is an actual "super power" on the island, and is only acquired by defeating the first five super villains (Copycat, Speeding Spike, Sir Rebral, Ratman, and Crusher), using your wits only. The pay phone will then ring and give you flying power, which you need to catch Betty Jetty. (Super Flying Power works only on this island, but comes in handy on the various ad games, when they are accessed from Super Power Island.)
The red wheels that raise and lower the water are in the sewer, not by Ratman. Swim left to find the first one (lowers the water), then right to find the other two (raise the water). When you enter the control room, you need to reach the final red wheel, at upper right, that dumps sludge on Ratman and the flies. (see related question)
Once you have your Superhero ID and the special cuffs from the prison, go right and you will find Copycat in the bank and Speeding Spike in the subway (Downtown). Sir Rebral and Ratman are in City Park (Ratman in the sewer under the restrooms). And Crusher is at the far right in the junkyard. Betty Jetty is at the top of the skyscraper, but you can't chase her until you have your super flying power, which you get by capturing the other 5 villains.
find ned
The rats and stinging flies are Ratman's loyal pets. When you try to catch him, you have to get past them. The way to do this is to reach the final red wheel in the sewer control room. Time your jumps to dodge the rats and find it at the upper right. When you turn the wheel, it dumps sludge on Ratman and scares off his flies. Unfortunately they will now attack you. Run and jump to avoid them, and use the large pipe at the center of the room to jump over to where Ratman is. Knock him down and cuff him.
Go left and lower the water level with the red wheel. Then raise it again until you can reach the door at the upper left (do NOT turn the wheel there!). Go through the door to find Ratman.
You have to be a super hero and find the old super hero talk to him.
The first red wheels that raise and lower the water are in the sewer, not by Ratman. Swim left to find the first one (lowers the water), then right to find the other two (raise the water). When you enter the control room, you need to reach the final red wheel, at upper right, that dumps sludge on Ratman and the flies. (see related question)
Ratman is hiding in the sewer with his loyal rats and stinging flies. To defeat him, you have to get past them.The procedure :Find Ratman in the sewer. Enter the public restrooms near the park. Go down into the drain.Go left and lower the water level at the control valve (red wheel). Go to the right and raise the water with the second red wheel. Swim past the pipe at left to reach the control room door.When you find Ratman, go to the right and jump past his rats to reach the upper control wheel. This will dump water on Ratman and disturb the flies.Dodge the flies and go left, jump over to Ratman and knock him out.Arrest him with the special Anti Power Handcuffs