We thought we knew about the “Glee” Tuesday (Nov. 16) episode “The Substitute,” but now we’re not so sure.

In the episode, Gwyneth Paltrow comes in as substitute teacher Holly Holiday and by now we know she’ll be singing a mashup of “Singin’ in the Rain” and “Umbrella” (ella, ella).

The evidence:

glee gwyneth paltrow umbrella 500 'Glee' mini Gleeks peek: Mr. Schue's hallucinationBut what’s going on with this picture?

glee hallucination 500 'Glee' mini Gleeks peek: Mr. Schue's hallucinationFOX provides the helpful caption: “In a hallucination, Will sees the members of the glee club as children.” Oh, Mr. Schue, is this what drives you out temporarily so that Holly can come in?

We’re loving the mini-Gleeks, and in case you can’t figure out who’s who, here are the grown versions:

glee 207 new directions 500 'Glee' mini Gleeks peek: Mr. Schue's hallucinationUm, wait. Where’s Quinn?

“Glee” airs at 8 p.m. ET, Tuesdays on FOX.

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Photo credit: FOX