Click the Mouse and Mauswerk: Mouse

Click the Mouse and Mauswerk: Mouse is an installment in the Click the Mouse and Mauswerk series.

Plot
Performing the "O-U", "ow" sound in their hit word "mouse".

Lyrics
(singing repeated the letters o-u "ow" sound)

Missing Letter
m__se

m o u se

Adding Letters and Words
m and se + ou = mouse

Only Appearance

 * Out in Outer Space