Mega Man V

Mega Man V, known in Japan as Rockman World 5 (ロックマンワールド５), is the last game from the Mega Man classic series for Game Boy. The game has Super Game Boy support, and at one time was considered for a port to the Game Boy Color for Q4 1998, but the project was eventually abandoned. 

Story
From the game's opening scene:

''In the year 20XX AD, the world is at peace thanks to Megaman. Dr. Wily's fourth attempt at world domination has failed and his name has once again faded from the minds of the citizens of the world. A few months later... '' (Rock and Roll are walking through a field and suddenly a mysterious robot appears in front of them.)

Terra: "So, you are the famous Megaman! I am Terra - and you will soon be my slave!"

(Roll retreats and Rock turns into Mega Man to fight against Terra, but even the charged shot doesn't worked on him, and is defeated.)

Mega Man: "What?! My Mega Buster has no effect on him..."

A few hours later, the world was attacked by warrior robots from space.

Mega Man (awakening): "Where am I?"

Dr. Light found Megaman and equipped him with the new "Mega Arm". The most powerful weapon ever devised.

Why have the Stardroids come here!?

Dr. Light: "Megaman, our world is once again in chaos. The alien robots call themselves "Stardroids" and have conquered most our major cities. They are constructed of alien material which render our weapons useless. But, I have done some analysis and constructed a new weapon for you. It will replace your Super Mega Buster. It is called the "Mega Arm" and it allows you to charge energy in your fist before you fire it. I have also created a new assistant for you. His name is "Tango". I'll enhance this item replicator to make powerful items for you. Collect as many P Chips as possible and return to my lab to exchange them for power-up items. Good luck, Megaman."

Bosses
Instead of using eight bosses from two NES games like the previous games, all eight bosses from Mega Man V are new.

First four Stardroids (Robot Masters):
 * SRN-002 Mercury
 * SRN-003 Venus
 * SRN-004 Mars
 * SRN-009 Neptune

Mid Boss: Dark Moon

Second four Stardroids:
 * SRN-005 Jupiter
 * SRN-006 Saturn
 * SRN-007 Uranus
 * SRN-008 Pluto

Final stages:
 * SRN-001 Terra (Stardroids' leader)
 * Skull Blazer
 * Enker (from Mega Man: Dr. Wily's Revenge)
 * Quint (from Mega Man II)
 * Punk (from Mega Man III)
 * Ballade (from Mega Man IV)
 * Rematch against eight Stardroids
 * L. Knuckle and R. Knuckle
 * Brain Crusher (Dr. Wily)
 * Sunstar (Final boss)

Trivia

 * Like Sunstar, the Stardroids are robots from an alien civilization that Dr. Wily found in some ancient ruins. Dr. Wily then reprogrammed these robots to use them for his world domination scheme.