<p>I wonder if you opened this dataset in ENVI using the File &gt; Open As &gt; Landsat &gt; GeoTIFF with Metadata reader, and choosing the _MTL.txt file? If you do this, then ENVI should open the image as a single multi-band image. But if you are opening each TIFF image separately, then ENVI does not understand that they are part of the same image, and will not let you display them together in the same layer.</p> <p>- Peg</p>