The Extension Corps consisting of Ecks, Ten, and Shun can be fought as a boss at the Fortress Zokket in Mario & Luigi: Brothership. Read on to know more about the Extension Corps, their location, attack patterns, rewards, as well as a detailed strategy on how to beat Ecks, Ten, and Shun.

Extension Corps Location and Details

Extension Corps Information

Boss Information
Extension Corps
Location	Fortress Zocket
Level	39
Best Option to Attack With	Either Hammer or Jump Attacks

Encountered in the Fortress Zokket

The Extension Corps can be encountered and fought all at once at Fortress Zokket. You must defeat Ecks, Ten, and Shun in order to progress and fight the final boss of the fortress, Zokket.

How to Beat the Extension Corps

Extension Corps Strategy
Use Kaboom Attack Battle Plug Combos Use Multi-Target Bros. Attacks Unequip the Auto Mushroom Battle Plug Equip the Protectus Battle Plug Once They’re Invincible

Use Kaboom Attack Battle Plug Combos

Recommended Battle Plugs
Kaboom Attack	Surprise Iron Ball
Anti-Zokket Specialist	Dizzifying Attack
Fiery Attack	Icy Attack

Since you will be fighting all three members of the Extension Corps at the same time, it would be best to use the Kaboom Battle Plug in order to damage everyone. Combine it with plugs such as Surprise Iron Ball, Anti-Zokket Specialist, and the different status attack plugs for more damage.

Make sure to target the middle member, Ten, whenevery you do a Jump or Hammer attack in order for the Kaboom plug to affect all three of them.

Best Battle Plug Combos

Use Multi-Target Bros. Attacks

Bros. Attacks that can hit multiple targets such as the Bomb Derby attack are best to use in this battle. However, take note that this will not activate your Kaboom and other offensive Battle Plugs.

You may want to use only Mario’s multi-target Bros. Attacks, and let Luigi use his regular Jump or Hammer attack.

List of All Bros. Attacks

Unequip the Auto Mushroom Battle Plug

Battle Plug	Effect
Auto Mushroom	When your HP becomes low, will automatically use a Mushroom.

At some point during the battle, Shun will equip their side with a PunishMush Battle Plug, which will cause damage to either Mario or Luigi if they eat a Mushroom.

Make sure not to eat any Mushrooms and unplug your Auto Mushroom Battle Plug in case you have it active. If you need to heal, use Nuts instead.

How to Heal and Restore Health

Equip the Protectus Battle Plug Once They’re Invincible

Battle Plug	Effect
Protectus	Reduces the damage you suffer from enemies to 0.
Charge Bank	When another equipped plug would lose charges, this plug's charges decreases instead.

Near the end of the battle, the Extension Corps will activate the Invincible Battle Plug. This will make them invincible but will also make them explode in a few turns.

You will want to make sure that your Protectus plug will be active by the end of this phase, which is about five turns long, in order to protect Mario and Luigi from the final explosion. Make this plug last longer in case you get hit by their attacks before the explosion by also equipping the Charge Bank plug.

No Need to Hit Your Attacks

In this last phase of the battle, all you need to do is dodge or counter their attacks. Your attacks won’t do anything once they’re invincible, so it’s okay if you miss them.

Extension Corps Attack Patterns

Extension Corps Attacks
Ecks’s Battle Plug Heist Ten’s Rolling Globe Ten’s Solo Attack Set Shun’s Barbell Attack Shun’s Dumbbell Attack Extension Corps Attack Combo

Ecks’s Battle Plug Heist

How to Dodge	This attack cannot be dodged.
How to Counter	Once Ecks is in front of a brother, quickly swing this brother's hammer.

Upon successfully landing this attack, Ecks may steal one of your Battle Plugs. Try to make sure you can counter this attack every time.

Ten’s Rolling Globe

How to Dodge	This attack cannot be dodged.
How to Counter	Smash the orb with your Hammer three times to dismount Ten. Swing your Hammer one last time while he's down to deal damage.

Ten also uses this attack when you first fight him on Desolatt Island.

How to Beat Ten

Ten’s Solo Attack Set

For this attack, Ecks and Shun will disappear for a short period of time, and Ten will perform a series of attacks on both Mario and Luigi.

Tapping Headbutt

How to Dodge	This attack cannot be dodged.
How to Counter	After Ten taps his foot twice, swing your Hammer once Ten jumps toward his target.

Energy Ball

How to Dodge	This attack cannot be dodged.
How to Counter	Swing your Hammer once Ten releases the ball of energy.

Sword Dance

How to Dodge	This attack cannot be dodged.
How to Counter	Swing your hammer once Ten is right in front of the target brother.

Shun’s Barbell Attack

How to Dodge	Press the jump button of the brother Shun turns to face, then jump after the barbell is thrown.
How to Counter	This attack cannot be countered.

Shun’s Dumbbell Attack

How to Dodge	Jump with both brothers after Shun throws the dumbbells.
How to Counter	If you dodge the dumbbells, they will come back and hit the Extension Corps from behind.

Extension Corps Attack Combo

Combo Part 1: Ten

How to Dodge	Watch the four targets Ten locks in. Jump with the correct brother when the energy ball targetted at them is about to hit.
How to Counter	This attack cannot be countered.

Combo Part 2: Ecks

How to Dodge	Press the jump button of the corresponding brother as Ecks flies by.
How to Counter	Jump then land on Ecks as he flies by. Countering will stop the attack from progressing to Shun’s part.

Combo Part 3: Shun

How to Dodge	This attack cannot be dodged.
How to Counter	Wait and watch for the punching bag to appear on screen. Quickly ready the hammer of the brother it’s about to hit, then swing when it’s about halfway down the screen.

Extension Corps Rewards

EXP and Item Rewards

All Extension Corps Rewards
EXP	17,100 EXP
Coins	1,448 Coins
Item Drops	・ Max Mushroom ・ Max Nut ・ Max Syrup Jar

Mario & Luigi: Brothership Related Guides

List of Bosses

All Story Bosses

List of All Bosses
Gorumbla	Gobblick
Mega Snaptor	Ten
Sharpcask	Pipegunk
Bowser	Glohm Bowser
Great Conductor	Extension Corps
Zokket	Glohm Gorumbla
Reclusa	-

All Optional Bosses

List of All Bosses
Glohm Gobblick	Glohm Sharpcask
Glohm Pipegunk