Guys' alliances

The Guys' Alliances are alliances formed by multiple male contestants throughout Total Drama.

Hide and Be Sneaky
After the events of Search and Do Not Destroy in which Trent ends up leaving the island, the guys realize they are outnumbered six to four. As a result, Duncan gets his friends DJ, Geoff, and Owen to gather into a cave during the challenge to discuss this situation, and to form an alliance, before the girls have a chance to eliminate the rest of them. Owen feels guilty about joining it, until Duncan forces him to join. It is formed to make sure that a guy wins Total Drama Island. The only thing that the alliance actually accomplishes is Bridgette's elimination.

That's Off the Chain!
The alliance is mentioned by Heather. Plus, the guys interact a lot in this episode, especially when they help Geoff get over Bridgette's elimination.

Hook, Line, and Screamer
It is presumed that the alliance dissolved after DJ was eliminated in Hook, Line, and Screamer.

The Very Last Episode, Really!
Regardless of the alliance disbanding, a member of the alliance still managed to win Total Drama Island. All the members rooted for him to win.

Total Drama, Drama, Drama, Drama Island
Owen, DJ, Tyler, and Cody form a guys' alliance to find the briefcase with the million dollars in it. The team is the first to find the case, but immediately become paranoid and distrusting of each other, resulting in Cody tying the team together to prevent the team from splitting up; the team ultimately lose the case to Harold and Heather when they drop it while Owen is going to the bathroom. They regain the case again, but lose it after Courtney steals it. DJ and Owen make it to Total Drama Action, while Cody and Tyler do not.

Super Hero-ld
This is the start of the third stable guys' alliance. At the beginning of the episode, Justin points out that they guys are outnumbered and need to band together to overpower the girls. All of the guys agree to work together and the second guys' alliance is formed. After the superhero challenge, the guys try to decide which of the girls they want to eliminate. Justin wants Courtney eliminated, but Duncan reminds him that she had invincibility. Duncan suggests getting rid of Leshawna, much to Harold's refusal. Later, Duncan convinces Courtney to vote Leshawna off, and Courtney manages to convince Harold to do the same. The guys prevail and Leshawna is voted off, to the other girls' surprise, but Harold confesses his actions to Leshawna and begs for forgiveness. She forgives him before leaving in the Lame-o-sine.

The Princess Pride
Duncan is out of the alliance in The Princess Pride when he and Justin start fighting over Courtney. In the final challenge, Harold and Justin keep the alliance going to defeat Duncan, but then Justin betrays Harold. When Justin is eliminated, Harold and Duncan show no concern at all, indicating that the short-lived alliance had ended.

Total Drama Island

 * Duncan (leader, voted off in Are We There Yeti?)
 * Geoff (voted off in Trial by Tri-Armed Triathlon)
 * DJ (eliminated in Hook, Line, and Screamer)
 * Owen (winner of Total Drama Island)

Total Drama Action

 * Justin (leader, voted off in The Princess Pride)
 * Harold (voted off in 2008: A Space Owen)
 * Duncan (winner of Total Drama Action)

Trivia

 * Trent was the only male in Total Drama Island to make it to the merge and not to be in the alliance.
 * These alliances were formed due to the fact that there were more female contestants at that time.
 * The first was formed when there was six girls and four guys.
 * The second was formed when there was four girls and three guys.
 * Justin, the leader of the second guys' alliance, was the first eliminated out of the alliance.
 * The guys' alliance in Total Drama Island was composed of a friendship, while each person in the guys alliance in Total Drama Action seems to have a conflict with one another.
 * Duncan is the only male to be part of both seasons' alliances.
 * He also was part of both Leshawna's Alliances.
 * In every Guys' Alliance so far, the season's winner was a member of it.
 * The two same contestants also were in an alliance with Leshawna in the same seasons.
 * Geoff is the only male of the first season's alliance who did not make a cameo appearance in Total Drama: Revenge of the Island.