My son is stuck on the 2nd level of Ben 10 and he cant get through the door that opens when you stand on the access plate. how do we do it

all this is covered in the FSM. step by step. under body or doors.
2nd best is alldata.com
what door? you never said and steps can very by body options.
name the door,
i guess the latch is bad?
here are the words, for door lock motor.
lots of steps. my wild guess , it the door cover is off.
and the plastic film removed
and you get stuck here,

1. Remove the tape covering the access hole on the carrier plate and discard. Access the window regulator liftplate through the hole in the carrier plate.
2. Push down the door glass (1) and use a slotted screwdriver to release the tab on the window regulator liftplate (2). Lift the glass up and secure to the header.
3. Remove the three screws (2) securing the door latch to the door shut face.
4. Remove the one screw (1) attaching the latch bracket to the door shut face.
5. Disconnect and remove the electrical connector (1) from the door (4).
6. Remove the 10 screws (3) from the carrier plate (2).
7. Disconnect the outside mirror electrical connector.
8. Remove the carrier plate (2) from the door (4). end

once carrier is out there is chapter on that , disassebly

really, buy the FSM
or log in to alldata.com
and avoid making wrong moves, or getting hurt.

feed it a dictionary

by hitting it arms and turn to ben when it shows him and press A to do the como move allso move your wii remote to the omnitrix when shown

You go with iron cover where is ! marked then you touch the down (south)

Use the monkey try B and soon S

on a wii game ben 10 im stuck on the level gold coast theater and would like to know what to do to get past it?

you ganna upgrade the system version

Sorry man but if there erased you cant get them back

U got stand on the first plate with the statue in front of u and then u should kick it to the other plate and then u should roll thru to the other side.

on the level select screen ,down the bottom there will be a back,upgrades and a go button . just press the upgrades icon for the upgrades to appear