CLU 2.0

A former resident of the Realm of Sleep, after his world, the Grid, was freed from the Key of Sleep, Clu was recruited into Xehanort's Syndicate as leader of the Digital Heartless.

Previous History in Kingdom Hearts
In Kingdom Hearts 3D, Clu appeared as the ruler of the Grid who had taken over his world thanks to the help of his special corruption powers.

After Flynn's promotion to CEO of ENCOM, CLU 2 is created in order to oversee the Grid in his place with help from Tron. At one point, a new race of programs, ISOs, emerge from the Sea of Simulation; Flynn sees these as the next step in human evolution, but CLU 2, having been programmed by Flynn to build the "perfect world", sees the ISOs as an imperfection, and due to their differing opinions, performs a coup d'etat. In the ensuing scuffle, CLU 2 fights against Tron while Flynn makes a run for it, but CLU 2 gains the upper hand and defeats Tron, but rather than kill him, he repurposes him to serve him as Rinzler. CLU 2 then oversees the "Purge", a genocide of the ISOs, and brings the Grid under his control.

Over the next twenty years, CLU 2 discovers that Flynn's identity disk, the Grid's master key, will lead him to the real world, which he hopes to take over and make a part of his "perfect world". To this end, he sends a page to Flynn's son, Sam, in order to lure him into the Grid, but Sam escapes with help from the last remaining ISO, Quorra. Eventually, CLU 2 tracks them to Flynn's hideout and gains possession of Flynn's disk with help from a double-agent, Zuse. However, as CLU 2 prepares to lead his army into the real world, he is stopped by Kevin, Sam and Quorra, who aim to reach the I/O tower and escape while leaving CLU 2 trapped inside forever. During the chases and fights, Rinzler remembers his past as Tron and almost kills CLU 2, but CLU 2 survives and pursues the Flynns and Quorra to the I/O tower. A final confrontation breaks out, and Flynn sacrifices himself to reintegrate CLU 2 into his being while Sam and Quorra escape, destroying CLU 2 once and for all.

Role in KH III
In Kingdom Hearts III, CLU 2's data file was restored by the Young Xehanort who used the powers of darkness to revive the evil program to his full power. CLU wanted revenge on Sora and Sam Flynn for defeating him before, so he all too eagerly joined up with Master Xehanort and his Syndicate as the leader of the Digital Heartless.