Plot summary
Cleveland Jr. is building a model rocket for the school science fair. Roberta's new teacher, Ms. Eck challenges Roberta to prove she can get by without her looks and has her alter her appearance by wearing a 'fat suit'. Her first day as 'Tyra' gets off in an inauspicious start when she is rejected by Federline and the teachers she previously had wrapped around her finger. Cleveland Jr. sees her alone in the cafeteria and warms up to her. When he shows her his model rocket, which is not only failing but is being outmatched by the geeks who are translating Klingon, she helps him with the design flaw. They win the science fair - probably because of the TIE fighters the rocket deployed to attack the geeks - and Ms. Eck gives Roberta and A Grade for proving she more than just looks.
Credits
Adapted from Wikipedia contributors, The Cleveland Show season 1. HTML formatting and reference markers removed.