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Episode 25 Return was the last episode of .hack//SIGN that aired on TV. The ending is meant to be picked up in the PS2 videogame .hack//Infection (given some time has passed between the end and start of).

There are 3 additional episodes after .hack//SIGN, these three are OVA's. The first was .hack//Intermezzo which can be watched any time during .hack//SIGN as it's a flash back to a certain .hack//SIGN's character's beginnings using a different character. The next OVA was .hack//GIFT which is a collab between the .hack//SIGN cast and the .hack//Infection cast in a funny slapstick comedy with a different animation style. And finally the second collab .hack//UNISON which shows an afterparty of both the .hack//SIGN and .hack//Infection cast getting together and hanging out.

While Tsukasa's mind was not trapped in a monster and free to roam about The World, without being able to logout. Sora was not so lucky as the voice speaking to Sora (Morganna) spoke to him about a fate worse than death by being unconscious, alive, but unable to move about The World and sitting backseat to a monster and watching all the atrocities it commits i.e. Tomonari and Mai from .hack//LIMINALITY, all of the cast of .hack//Infection except Kite and Mistral, and a few unnamed players.