Unhide worksheet in Excel 2007

To unhide worksheet(s), perform the following:
On the Home tab, in the Cells group, click Format, point to Hide & Unhide and click Unhide Sheet.

If multiple sheets are hidden, you will see the Unhide dialog box that will display all the hidden worksheets. Click the worksheet that you want to unhide and click OK. For unhiding multiple worksheets, you have to repeat the process of unhiding worksheet(s) and selecting the worksheet that you need to unhide.