Comic-Con: DC’s Legends of Tomorrow season 4 trailer arrives The CW has released the official DC’s Legends of Tomorrow season 4 trailer, which you can check out in the player below. Let us know what you think in the comments! Season 4 of DC’s Legends of Tomorrow will premiere on Monday, October 22 on The CW. After defeating Mallus by cuddling him to death with a giant stuffed animal named Beebo, the Legends were ready to ease off the gas.