Dominator Invasion (Earth-1: Pre-Crisis)

The Dominator Invasion is an invasion planned by the Dominators to kill all Metahumans after the Flashpoint raising their awareness on the possible harms of Metahumans.

Background
In 1951, the Dominators felt a threat from the meta-humans in the JSA and arrived on Earth to identify the threat. After the truce from Agent Smith, they never returned. However, after Barry created Flashpoint, they felt threatened again and attacked Earth in 2016.

Sending in dropships
In 2016, the Dominators send four dropships and one fell in Central City. The Flash arrived, and the Dominators ran out of the ship. On the next day, Lyla was sent to Central City as the director of A.R.G.U.S., and she later went to S.T.A.R. Labs to brief Team Flash about the Dominators. Later, Barry realizes the team is not enough to fight aliens and went to Star City to find Oliver's help. They later sent a message to the Legends, and they decided to have the S.T.A.R. Labs hanger as their base. As the Legends arrived, Barry and Cisco went to Earth-38 to find Supergirl. After they returned, Barry and Oliver heard the message sent from himself to Rip Hunter in the year 2056. Later, they had a test run against Supergirl, and they received a signal saying the Dominators' base on Earth. However, Cisco accidentally found the message and told everyone about Barry's mistake in Flashpoint. Barry later convinced them to not trust him and should go without him. Oliver, protecting Barry, decided to stay with him in S.T.A.R. Labs. The rest of the team went to fight the Dominators and was mind controlled by them which made them to cause damage outside of S.T.A.R. Labs. Barry and Oliver heard explosions and went to fight them. However, after Wally went to help them, Barry was overwhelmed and Oliver ran out of arrows. They had to split up and Barry acted as a bait to lure a mind controlled Kara to destroy the controller of their minds. After they destroyed it, Oliver along with other non-Metahumans team members were taken away by the mothership.

Later, they lived in an alternate reality where they have their happy endings. However, the team started having flashes on their real lives and eventually found out that they are in an alternate reality. The team later fought against old enemies such as Malcolm Merlyn, Slade Wilson and Damien Darhk. Despite their rough fight in the past, they easily won the fight as they know their weaknesses from the real world. Meanwhile, Cisco and Team Arrow were working on a way to find the lost team, and they needed a special chip in Van Horn Industries. The team later called Barry and Kara to help, but they faced Laura Washington, who got the chip they were looking for. After they defeated her, they retrieved the data and knows where the lost team are. As the lost team escaped through a dropship, they had no idea how to control it. Luckily, Cisco sent the message to the Waverider and Nate drove it to rescue them. After, they arrived on the ship, Gideon translated the Dominator language as the Dominator mothership arrives on Earth .

On the next day, the team realized that they need more information and Nate proposed to time travel back to 1951 and abduct one of the Dominators. As Cisco is avoiding Barry, he and Felicity tagged along on the Waverider. After they arrived in 1951, the Legends knocked out a Dominator, but they were kidnapped by Agent Smith to an undisclosed location. As they were in the same room as the Dominator, they asked questions, and they realize that Metahumans are the targets. In 2016, the rest of the team also acquire the same information from an older Agent Smith and Barry decided to sacrifice himself for the world. Cisco and Felicity in 1951 later found some firearms and busted into the facility to rescue the Legends. The Legends later also rescued the Dominator and sent him back home through the dropship Oliver and the lost team took. Cisco kept the transmitter and as they arrived back in 2016, the Dominator contacted and told them he could spare their lives as they saved his. Cisco later vibed and talked to him again which made Cisco knowing their reason of coming to Earth is because of the creation of Flashpoint. As Stein and Caitlin successfully created a nano weapon with the help of Lily Stein, the team engaged with the Dominators. After the battle, the team were honored by the president in an event. After the event, the Legends returned to the Waverider, Supergirl returned to Earth-38 and Barry went to a bar with Oliver.