Welcome to Earth-2
... that The Flash episode "Welcome to Earth-2" featured many actors portraying doppelgängers of their roles from the series?
... that <i id="mwBJM"><a href="./The_Flash_(2014_TV_series)" id="mwBJQ" rel="mw:WikiLink" title="The Flash (2014 TV series)">The Flash</a></i> episode "<b id="mwBJU"><a href="./Welcome_to_Earth-2" id="mwBJY" rel="mw:WikiLink" title="Welcome to Earth-2">Welcome to <span about="#mwt56" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"Earth-2"}},"i":0}}]}' id="mwBJc" typeof="mw:Transclusion">Earth-2</span></a></b>" featured many actors portraying <a href="./Doppelgänger" id="mwBJg" rel="mw:WikiLink" title="Doppelgänger">doppelgängers</a> of their roles from the series?