The Real Ghostbusters S06 E10 Deja Boo

"Who you gonna call? Ghostbusters!"

The sinister Professor Dweeb captures Slimer by posing as an innocent ice cream vendor. By using his new invention, Dweeb intends to read Slimer's mind and discover a ghost's vulnerability. Helplessly trapped, Slimer can only watch as the evil Professor scans through his memories.