This file is indexed.

/etc/grub.d/22_invaders is in grub-invaders 1.0.0-13.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash -e

if test -e /boot/invaders.exec ; then
  source /usr/lib/grub/grub-mkconfig_lib
  INVADERSPATH=$( make_system_path_relative_to_its_root "/boot/invaders.exec" )
  echo "Found GRUB Invaders image: /boot/invaders.exec" >&2
  cat << EOF
menuentry "GRUB Invaders" {
EOF
  prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/g"
  cat << EOF
	multiboot	${INVADERSPATH}
}
EOF
fi