This episode guide has been compiled from incomplete video material.
Telly eagerly awaits the arrival of his new "Secret Disguise Kit," which he believes will make him unrecognizable to all. The delivery woman (disguised as a man) brings it to him and he drags the box behind a crate in the arbor, preparing his first disguise.
Telly emerges with a hat and mustache, claiming to be "Mr. Wallace." Susan and Lexine see right through him, though. He believes it's because they recognize Freddy and he applies a mustache to him too (calling him "Melvin"), but Gordon still recognizes him. Telly vows his next disguise will fool everyone, even the viewer.
Telly now dons a football uniform and beard, posing as "Number 18" (because of his jersey number). He tries to listen in on Susan's story, acting like a football player, but they soon realize it's him. "What does a person have to do to go unrecognized around here?"
Dressed as a dentist, Telly claims to be "Dr. Jacobson" and says some typical dentist things to Lexine and the kids, who fail to be duped again. Barkley gives him away again by licking him, being able to identify Telly anywhere. Telly decides to stop dressing as people and now pretends to be a thing.
Telly and Freddy are now dressed as the letter T, talking with a silly voice. He becomes frustrated when Gordon and Susan recognize him yet again. They encourage him to keep trying and Telly goes to get his final disguise, "the big one" he claims.
The grown-ups and kids conspire on the stoop and discuss Telly's situation. They agree to act like they're fooled by whatever disguise Telly shows up in. He arrives, disguised as "Bonko the Clown," and everyone treats him as such. He then can't convince them he's actually Telly, until they admit they were only pretending. Telly is sad, when a man comes by, asking directions to the park. He assumes Telly is a clown and heads off, meaning Telly's disguise actually worked. As Gordon announces the sponsors, Telly plans to use more disguises to fool people he doesn't even know.
Coming Soon on Sesame Street: Elmo sings about the letter E.