There were some cartoons in the 90's

I don't remember exactly but this was what happened

The main character 'A boy' had a dagger or knife and he raised his dagger and shouted something as I told you I can't remember so the details are going to be a little fussy

When he shouted a robot came and the boy was somehow absorbed by the robot and the boy was in ctrl

I also remember that this robot could join with other robots to make them super powerful achines

I don't remember anythung else

U guys have any idea about these cartoons

Last time I saw these cartoons I was in 5th grade and the year was 1997...

What kind of robot was it, cause there were plenty of cartoons with daggers and I don't think your referring to the power rangers.