‘New Girl’ Season 4 Casting: ‘Cosby Show’ Star Lisa Bonet To Appear, Learn About Jess’s New Man From Tonight’s Episode

New Girl is pulling out all the stops in Season 4 when it comes to guest stars. First Jessica Biel, then Kaitlin Olson from It's Always Sunny in Philadelphia and now Lisa Bonet will be guest starring.

The Cosby Show alumna will be making an appearance later this season. Lisa "will play an education guru in an upcoming episode," TV Line exclusively reported.

Lisa, best known for her role as Denise Huxtable on The Cosby Show, will be playing a different role on New Girl. According to TV Line, her character will appear when Jess and Coach attend a teacher's conference. With Lisa's interference, Jess will fall for a new science teacher at her school, Ryan (Julian Morris).

As the new science teacher, Ryan will challenge Jess to fight her feelings because he is a teacher and she is the vice principal, and therefore they shouldn't date one another.

"The complication is that she's very much his boss. Jess is fighting her feelings for this teacher at work," executive producer Liz Meriwether told Entertainment Weekly.

Entertainment Weekly first reported Julian's casting as the new science teacher earlier this summer.

"The Once Upon a Time and Pretty Little Liars star will play Ryan, a distractingly handsome teacher who replaces Jess in the classroom now that she's the vice principal," EW reported.

Even though Jess will fall for Ryan eventually this season, tonight's episode will involve a man with a different problem: a small penis.

"Someone came up with the idea of Jess dating someone with a very small penis. That lead to Google image searching ... which led to the medical phenomenon," episode writer Josh Malmuth told The Hollywood Reporter.

"It's about a penis, so I think people will naturally be inclined to tune in," he added.