<s>
is	O
a	O
beat	B-Application
'	I-Application
em	I-Application
up	I-Application
shooter	O
released	O
as	O
an	O
arcade	B-Application
video	I-Application
game	I-Application
by	O
Sega	O
in	O
1990	O
.	O
</s>
<s>
It	O
was	O
ported	O
to	O
the	O
Genesis/Mega	B-Operating_System
Drive	I-Operating_System
and	O
Master	O
System	O
.	O
</s>
<s>
The	O
Mega	B-Operating_System
Drive	I-Operating_System
version	O
was	O
re-released	O
on	O
Wii	B-Operating_System
's	O
Virtual	B-Application
Console	I-Application
in	O
2007	O
and	O
was	O
also	O
included	O
on	O
Sonic	B-Application
's	I-Application
Ultimate	I-Application
Genesis	I-Application
Collection	I-Application
for	O
Xbox	B-Operating_System
360	I-Operating_System
and	O
PlayStation	B-Operating_System
3	I-Operating_System
.	O
</s>
<s>
The	O
game	O
was	O
also	O
re-released	O
on	O
the	O
Nintendo	B-Application
Switch	I-Application
Online	I-Application
+	I-Application
Expansion	I-Application
Pack	I-Application
in	O
2022	O
.	O
</s>
<s>
Alien	B-Application
Storm	I-Application
is	O
a	O
side-scrolling	B-Application
beat	I-Application
'	I-Application
em	I-Application
up	I-Application
.	O
</s>
<s>
The	O
game	O
resembles	O
Golden	B-Application
Axe	I-Application
,	O
with	O
a	O
similar	O
artistic	O
style	O
,	O
three	O
playable	O
characters	O
(	O
a	O
man	O
,	O
a	O
woman	O
,	O
and	O
a	O
novelty	O
character	O
)	O
and	O
pick-up	O
or	O
power-up	O
special	O
attacks	O
.	O
</s>
<s>
The	O
player	O
(	O
one	O
player	O
only	O
on	O
the	O
Master	O
System	O
version	O
,	O
up	O
to	O
two	O
players	O
on	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
version	O
,	O
three	O
on	O
the	O
arcade	B-Application
version	O
)	O
selects	O
from	O
the	O
three	O
different	O
characters	O
to	O
embark	O
upon	O
a	O
quest	O
to	O
save	O
the	O
Earth	O
from	O
an	O
alien	O
invasion	O
.	O
</s>
<s>
There	O
are	O
six	O
missions	O
to	O
complete	O
(	O
eight	O
in	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
version	O
)	O
with	O
several	O
stages	O
,	O
and	O
each	O
mission	O
has	O
the	O
player	O
blasting	O
aliens	O
,	O
from	O
the	O
streets	O
to	O
the	O
mother	O
ship	O
,	O
where	O
the	O
mother	O
of	O
all	O
aliens	O
can	O
be	O
found	O
.	O
</s>
<s>
In	O
a	O
similar	O
format	O
as	O
other	O
early	O
Sega	O
arcade	B-Application
games	O
,	O
each	O
character	O
has	O
unlimited	O
usage	O
of	O
various	O
short-range	O
attacks	O
,	O
i.e.	O
</s>
<s>
Scooter	O
will	O
teleport	O
out	O
of	O
his	O
present	O
location	O
and	O
leave	O
a	O
series	O
of	O
bombs	O
that	O
will	O
blow	O
up	O
on	O
the	O
appearance	O
of	O
aliens	O
,	O
after	O
which	O
he	O
will	O
re-appear	O
(	O
in	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
and	O
arcade	B-Application
versions	O
he	O
just	O
explodes	O
,	O
leaving	O
his	O
head	O
,	O
which	O
his	O
new	O
body	O
returns	O
to	O
retrieve	O
)	O
.	O
</s>
<s>
The	O
arcade	B-Application
original	O
features	O
an	O
alien	O
spaceship	O
,	O
an	O
alien	O
brain	O
and	O
a	O
single	O
boss	O
in	O
the	O
middle	O
of	O
the	O
game	O
that	O
has	O
three	O
distinct	O
forms	O
.	O
</s>
<s>
The	O
Mega	B-Operating_System
Drive	I-Operating_System
port	O
has	O
two	O
of	O
these	O
forms	O
as	O
three	O
separate	O
bosses	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
each	O
mission	O
,	O
the	O
side-scrolling	O
gameplay	O
shifts	O
to	O
either	O
a	O
shooting	O
gallery	O
perspective	O
where	O
the	O
player	O
must	O
take	O
out	O
the	O
aliens	O
that	O
pop	O
out	O
of	O
various	O
locations	O
,	O
similar	O
to	O
the	O
bonus	O
stages	O
of	O
Shinobi	B-Application
and	O
Shadow	B-Application
Dancer	I-Application
,	O
both	O
by	O
Sega	O
,	O
or	O
a	O
running	O
section	O
that	O
is	O
similar	O
to	O
the	O
side-scrolling	O
mode	O
but	O
plays	O
like	O
a	O
horizontal	O
shooter	O
instead	O
with	O
projectile	O
weapons	O
.	O
</s>
<s>
In	O
October	O
1993	B-Application
,	O
Atari	O
Corporation	O
filed	O
a	O
lawsuit	O
against	O
Sega	O
for	O
an	O
alleged	O
infringement	O
of	O
a	O
patent	O
originally	O
created	O
by	O
Atari	O
Corp	O
.	O
in	O
the	O
1980s	O
,	O
with	O
the	O
former	O
seeking	O
a	O
preliminary	O
injunction	O
to	O
stop	O
manufacturing	O
,	O
usage	O
and	O
sales	O
of	O
hardware	O
and	O
software	O
for	O
both	O
Sega	B-Operating_System
Genesis	I-Operating_System
and	O
Game	O
Gear	O
.	O
</s>
<s>
On	O
September	O
28	O
,	O
1994	B-Application
,	O
both	O
parties	O
reached	O
a	O
settlement	O
in	O
which	O
it	O
involved	O
a	O
cross-licensing	O
agreement	O
to	O
publish	O
up	O
to	O
five	O
titles	O
each	O
year	O
across	O
their	O
systems	O
until	O
2001	B-Application
.	O
</s>
<s>
The	O
Master	O
System	O
version	O
of	O
Alien	B-Application
Storm	I-Application
was	O
one	O
of	O
the	O
first	O
five	O
titles	O
approved	O
from	O
the	O
deal	O
by	O
Sega	O
in	O
order	O
to	O
be	O
converted	O
for	O
the	O
Atari	B-Device
Jaguar	I-Device
,	O
but	O
it	O
was	O
never	O
released	O
.	O
</s>
<s>
In	O
Japan	O
,	O
Game	O
Machine	O
listed	O
Alien	B-Application
Storm	I-Application
on	O
their	O
June	O
15	O
,	O
1990	O
issue	O
as	O
being	O
the	O
most-successful	O
table	O
arcade	B-Application
unit	O
of	O
the	O
month	O
.	O
</s>
<s>
Megatech	O
reviewed	O
the	O
Sega	B-Operating_System
Genesis	I-Operating_System
version	O
and	O
gave	O
an	O
overall	O
score	O
of	O
78%	O
,	O
they	O
praised	O
the	O
game	O
for	O
being	O
an	O
outstanding	O
conversion	O
of	O
the	O
arcade	B-Application
version	O
and	O
praised	O
the	O
graphics	O
and	O
saying	O
the	O
gameplay	O
is	O
highly	O
enjoyable	O
.	O
</s>
<s>
Mega	O
Play	O
's	O
four	O
reviewers	O
gave	O
above	O
average	O
reviews	O
and	O
praising	O
the	O
game	O
’s	O
graphics	O
,	O
animation	O
and	O
felt	O
the	O
game	O
was	O
a	O
near	O
perfect	O
port	O
from	O
the	O
arcade	B-Application
version	O
and	O
being	O
similar	O
to	O
Golden	B-Application
Axe	I-Application
.	O
</s>
<s>
In	O
2023	O
,	O
Time	O
Extension	O
included	O
the	O
arcade	B-Application
version	O
on	O
their	O
top	O
25	O
"	O
Best	O
Beat	B-Application
'	I-Application
Em	I-Application
Ups	I-Application
of	O
All	O
Time	O
"	O
list	O
.	O
</s>
