From CloudModding OoT Wiki
Actor 0x002A
ovl_En_Viewer
Version VRom VRam Size
Debug 00EE0050 00EE3290 {{{ram-start}}} {{{ram-end}}} 3240
NTSC 1.0 00C4E9B0 00C51860 {{{ram-start}}} {{{ram-end}}} 2EB0
PAL MQ 00E78FD0 00E7BE70 {{{ram-start}}} {{{ram-end}}} 2EA0

ovl_En_Viewer is the actor that manages various actors used in the "nightmare" cutscene, and the similar cutscene where Zelda escapes from Ganondorf.