Most are
but there are always exceptions e.g. Invader Zim.
(
Angelblood,
Sun 18 May 2003, 12:25,
archived)
Or Mork
/coat
(
King Ralph is drunk,
Sun 18 May 2003, 12:27,
archived)
Also
The aliens from Third Rock From The Sun.
(
Angelblood,
Sun 18 May 2003, 12:28,
archived)
Aliens
are the new Grey.
(
Professor Fnord Regius Professor of B3ta Chronology,
Sun 18 May 2003, 12:34,
archived)