Question: Why would Barry need Kara's help in gaining extra speed to return to his own dimension considering that the device he had on was capable of doing that?
Supergirl (2015)
1 question in Worlds Finest
Starring: Calista Flockhart, Melissa Benoist, Mehcad Brooks, David Harewood
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Answer: It was an experimental device and was not meant to propel him into another world, it happened by accident. He need an extra boost of speed to get him back home.